Escort warship — 'a ship that mostly did escort work' (The Firing Order, chapter 13); the books never name a class

ISV Redoubt

The professional naval lane of the expedition, and the ship that keeps moving when Sarah Bishop is absent. Her arrangement is known through the path a round takes — up out of a ready magazine into the cradle and up the second stage, through a handling room that calls each one out loud, to a mount whose shot comes back down through the deckhead as a flat knock you take in the knees — and through the plant four decks down, the loudest and hottest part of the ship, where an engineer sells readiness at an exchange rate.

Operator: ISCA Frontier Command
Registry: ISV — Interstellar Seam Vessel (; shared with ISV Palisade and ISV Breakwater)
Series: Closed Sky
Drawn as: SITE: her whole life, dated. Okada up the side 26 February 2350; the drill and the pawl's fourth foul; the crossing, first, Friday morning 10 March; at the tenth from 25 March; Rev A — the April action, the forward handling room a hole and fifteen dead, three directors; the second hit, the after director and the deck aft of the mess flat, two dead, two directors; 2350–51 the after room's transfer on a strop, one mount, nothing at the hoists; Rev B 2352 — the forward room rebuilt with new paint and a second mount on the wedge; 2353 the Captain taken off and Farzan holding her without the word. Casualties marked SPOILER.

Sheet 1 General arrangement — profile, looking to port 180.0 m overall · 180 frames at 1000 mm

Sheet 2 Deck plans — 5 decks, looking down 26.0 m maximum beam

Where she looks and shoots from. The bridge flat has a cold outboard side.

1-01 Forward mount Fr 14–24 published The Firing Order, chapter 17 ('four directors and two mounts'); The Defensible Route, chapter 28 ('the forward mount'); The Defensible Route, chapter 7 ('the flat outside the mount')
Fed by the forward handling room below it. Unproved until 2352: 'had never put a live round on a mount in all the time Sagoe had been its chief' (The Firing Order, chapter 10).
1-02 Forward director space Fr 24–36 published The Firing Order, chapter 17 ('the three in the director space above them' — above the forward handling room); The Firing Order, chapter 10 ('Two hands in the passage outside the director spaces')
Ilves's. ⚠ SPOILER (The Firing Order, chapter 17): 'what was left of the compartment above it was not going to be a compartment again, and above that there was a hole in the ship' — three of the fifteen died here.
1-03 Bridge flat Fr 40–60 published The Firing Order, chapter 22 ('read it out to *Redoubt*'s bridge at the end of the early watch'); Missing, Presumed, chapter 32 ('the outboard side of the bridge flat was cold, that somebody had put a jacket over the back of a chair nobody was using and it stayed there all day'); Missing, Presumed, chapter 22 ('came up to the bridge flat')
Farzan's plot. ⚠ The Captain is undocumented and deliberately unnamed: 'The Captain had given her the drill programme at the mooring in one sentence and had not asked about it since' (The Firing Order, chapter 4).
1-04 Screen station Fr 60–72 published The Firing Order, chapter 10 ('From *Redoubt*'s screen station it was thirty-seven'); The Firing Order, chapter 10 ('An escort flies a screen against the ways in')
Position abaft the bridge is the drawing's.
1-05 After director Fr 130–142 published The Firing Order, chapter 22 ('After director's gone. The space round it's gone.')
⚠ SPOILER (The Firing Order, chapter 22): lost to the third hit; two directors left. Four directors at the start of the April action (The Firing Order, chapter 17), three after it (ch17:229).
1-06 After mount Fr 142–154 published The Firing Order, chapter 4 ('the mount taking them one at a time so that each shot came back down through the deckhead as a flat knock you took in the knees'); The Firing Order, chapter 17
Directly over the after handling room. The proved mount.

The rooms that call the rounds. Forward room unproved, after room proved.

2-01 Flat outside the forward mount Fr 12–24 published The Defensible Route, chapter 7 ('they were in the flat outside the mount sitting on things and not talking much. There were nine of them'); The Defensible Route, chapter 7 ('a rope across the flat to stop anybody walking into it in the dark')
Where nine people sat after four nights at stations (2352).
2-02 Forward handling room Fr 24–36 published The Firing Order, chapter 4 ('The forward handling room was billed to run the same serial straight after'); The Firing Order, chapter 10; The Firing Order, chapter 17 ('Sagoe was on his knees at the second rack with his sleeves back'); The Defensible Route, chapter 7 ('now it was a room, with a deckhead and a hoist and a rail and a smell of new paint')
Sagoe's. Hoists, racks, a rail to the mount above. ⚠ SPOILER: Rev A (April 2350) 'a hole with the sky at the bottom of it' for most of two years; ten of Sagoe's fourteen died here (The Firing Order, chapter 17). Rev B (2352): rebuilt, proved, 'Sagoe's room was the proved one and the after room was not' (The Defensible Route, chapter 7).
2-03 Passage — the director spaces Fr 36–70 published The Firing Order, chapter 10 ('Two hands in the passage outside the director spaces had a long argument about whether a dry serial counted toward a sign-off')
Position is the drawing's.
2-04 Mess flat Fr 70–96 published The Firing Order, chapter 17 ('Ilves had the count on the mess table before midnight with her sleeves still rolled'); The Firing Order, chapter 22 ('The deck aft of the mess flat')
The mess table where the count was done: ninety-one, sixty-eight away, twenty-three.
2-05 Deck aft of the mess flat Fr 96–110 published The Firing Order, chapter 22 ('The deck aft of the mess flat was open to the ship's air for the eleven seconds it took the doors to shut on the interlock, and then it was not part of the ship any more'); The Firing Order, chapter 22 ('The party had a deck plate off and a light on a lead through the gap, and there was a smell of scorched insulation all through the flat')
⚠ SPOILER (The Firing Order, chapter 22): the third hit; two dead — a rating standing a circuit and a leading hand of the after room with a spanner in his hand (ch22:195–197). Interlock doors both ends.
2-06 Medical space Fr 110–122 fixed spec ruling 2026-09-21; Missing, Presumed, chapter 22 ('Two of Tunbridge's people were in the ship's medical space')
Named once; never placed.
2-07 After handling room Fr 130–154 published The Firing Order, chapter 4 ('Okada was the nearer of the two, up the side on the twenty-sixth of February'); The Firing Order, chapter 4 ('the after room calling each one out loud on its way to the mount, which nobody had ever ordered them to do and nobody had ever stopped'); The Firing Order, chapter 4 ('The after room had rounds at both hoists from nine … Okada was doing the calling'); Keller's Field, chapter 19 ('the after room's transfer, which had been built to pass rounds along a rail from a hoist to a mount')
⭐ A chief and Okada. Two hoists; the cradle; the second stage; the transfer rail to the mount overhead. The proved room in 2350. ⚠ SPOILER: two of its people died forward at the transfer in April (The Firing Order, chapter 17); by 2350–51 the transfer 'had no hoist and no rail either since the deck went' and was rigged 'with a strop and a beam clamp' (Keller's Field, chapter 19).

Key

Command
Navigation
Power
Habitation
Medical
Galley & mess
Access
Defence

Grade of every figure on these sheets

published Stated in the books. If a drawing disagrees, the drawing is wrong.
derived Arithmetic on published facts; the working is given.
fixed Canon was silent here and the drawing decided.

Principal figures

Each figure carries its grade: published (the books state it), derived (arithmetic on what they state) or fixed (the sheet's own decision, bounded by what the books rule out).

Length overall

180 m

fixedspec ruling 2026-08-31, kept 2026-09-21

⚠ NOT CANON. No dimension is stated. 'she is a long hull with her mass in her ends' (The Defensible Route, chapter 28) is the whole of it. Drawn smaller than Breakwater (220 m) and Palisade (265 m).
Beam

26 m

fixedspec ruling 2026-08-31

Systems

Magazines and feed

published

Five engagements up top and six hours to the rest

ReadyFive engagements — 'if they go tidy. There has never been a tidy one' (The Firing Order, chapter 4). Ninety-one rounds on the morning of the April action (ch17:159)
The pathReady magazine → cradle → second stage → handling room → rail → mount, the after room calling each round out loud (The Firing Order, chapter 4)
BelowSix hours to bring up, through the transfer pawl (The Firing Order, chapter 4)
The pawlFourth foul since the yard at the February drill; sixth by April; fifty seconds each (The Firing Order, chapter 4; ch17:229)
⚠ Resupply'no replacement stock of that class on any other hull in this formation, because you checked in February and I've checked since' (The Firing Order, chapter 17)
⚠ SPOILER — after AprilSixty-eight away, twenty-three left (The Firing Order, chapter 17); by 2350–51 'There is nothing at the hoists' and the old lot goes through the after room's transfer dry, one at a time (Keller's Field, chapter 19,:151)

The Firing Order, chapter 4,:23,:85,:89; The Firing Order, chapter 17,:225,:229

Plant and readiness states

published

Two states, never conflated — an exchange rate, not a limit

Full director set'Forty minutes of full set is three hours of running quiet' (The Firing Order, chapter 4)
Cost of it'Full set is the one that eats you' (The Firing Order, chapter 4)
Directors manned, rounds at the hoists'a tenth of that and I can carry it for days' (The Firing Order, chapter 4); held from 25 March for five weeks (The Firing Order, chapter 17)
The rate turns'Four days at the tenth is the cheap end of the rate. The rate turns over in the second week, and the same heat stops being cheap' (The Firing Order, chapter 4)
⛔ Never'That's not a limit, it's an exchange rate. The limit's further along and you won't like meeting it' (The Firing Order, chapter 4)

The Firing Order, chapter 4–39,:193–195; The Firing Order, chapter 17

Directors and mounts

published

Four directors, two mounts

At the crossingFour directors and two mounts (The Firing Order, chapter 17)
What a director gives'I've got arc. I've got the error on the arc. That's all a director gives you' (The Firing Order, chapter 10)
⚠ SPOILER — AprilThree directors: 'there is no fourth director between here and home' (The Firing Order, chapter 17); then two, the after director and the space round it gone (The Firing Order, chapter 22,:191)
⚠ SPOILER — 2352'there were two mounts on it now instead of one, and it was still a wedge' (The Defensible Route, chapter 7)

The Firing Order, chapter 17,:229; The Firing Order, chapter 22,:191; The Defensible Route, chapter 7

Standby ring and reserve set

published

What comes back when the lights go

Lighting'went to the standby ring and came back'
Plot'went out and came up on the reserve set with a second hole in it'

The Firing Order, chapter 22

What was checked

The books state distances aboard this ship. The drawing has to produce the same ones or it is wrong — so it is made to, and the working is shown. These run again on every build; a compartment moved by a metre fails them.

“The plant is four decks down from the bridge” The Firing Order, chapter 17 ('The plant was four decks down'); The Defensible Route, chapter 28 ('Thrust is made four decks down')

L1 (bridge flat 1-03) → L2 → L3 → L4 → L5 (plant 5-02): four levels down. Pass.
“The director space is above the forward handling room and the hull is above that” The Firing Order, chapter 17 ('what was left of the compartment above it was not going to be a compartment again, and above that there was a hole in the ship'); ch17:215 ('the three in the director space above them')

1-02 [24,36] on L1 sits directly over 2-02 [24,36] on L2, and L1 is the topside level under the hull. Pass.
“Rounds go up: ready magazine, cradle, second stage, handling room, rail, mount” The Firing Order, chapter 4 ('Rounds up out of the ready magazine and into the cradle and up the second stage, the after room calling each one out loud on its way to the mount … each shot came back down through the deckhead')

3-03 after ready magazine (z 6.0) → 2-07 after handling room (z 9.0) → 1-06 after mount (z 12.0), all at [130,154]; the same stack forward at [24,36] with 3-01, 2-02 and 1-01/1-02. Monotonic in z. The lower magazine 4-02 (z 3.5) feeds up through the pawl 4-01. Pass.
“The deck aft of the mess flat is aft of the mess flat, and the after director is aft of both” The Firing Order, chapter 22,:191

2-04 [70,96] → 2-05 [96,110]; 1-05 after director at [130,142]. Pass.
“Ninety-one rounds, sixty-eight away, twenty-three left, and no replacement stock in the formation” The Firing Order, chapter 17,:225

91 − 68 = 23. Both ready magazines together hold the count; the split between 3-01 and 3-03 is the drawing's. Pass.
“She went first, six minutes into an eighty-minute window, on a Friday morning — and no clock time is on the page” The Firing Order, chapter 3 ('*Redoubt* went first and went cleanly'); The Firing Order, chapter 4 ('asleep before Friday morning'); ch04:213 ('ran for eighty minutes … an escort goes first'); ch04:219 ('crossed the entry boundary six minutes into the window');:103 (10 March 2350 is a Friday)

The 09:26 / 08:50 / 10:40 of the 2026-08-31 sheet are withdrawn; the series bans clock stamps and none appears. Date derived from the weekday table; the minutes published. Pass.
“Overall length is the drawing's” spec ruling 2026-08-31

180 frames at 1000 mm = 180 m. No dimension is stated anywhere for her; graded fixed.

Service history

Compiled from

The Firing Order — ch03, 04, 06, 10, 13, 17, 20, 22, 24, 25
Keller's Field — ch19
The Defensible Route — ch07, ch28
Missing, Presumed — ch22, ch32
ISCA Frontier Command, Captain