The theme of the first Window is weapons of war.

 

The quotation reads: "I heard a voice from Heaven saying unto me write";
there is no reference on the window but this is taken from Revelation 14 v13:

"And I heard a voice from Heaven saying unto me, Write, blessed are the dead which die in the Lord from henceforth: Yea, saith the Spirit, that they may rest from their labours; and their works do follow them."
 

Starting from the bottom of the left-hand side and going in a clockwise direction, the panels illustrate:

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Call to war
Call to war

Proclaim ye this among the Gentiles; prepare war, wake up the mighty men Joel 3 v9

Shell Factory
Shell Factory

Whatsoever thy hand findeth to do, do it with thy might Ecclesiastes 9 v10

Howitzer
Howitzer

When the blast of the terrible ones is as a storm against the wall Isaiah 25 v 4

Liquid Fire
Liquid Fire

And signs in the earth beneath; blood, & fire & vapour of smoke Acts 2 v19

Zeppelin
Zeppelin

Thou shalt not be afraid for the terror by night Psalm 91 v5

Tank
Tank

“the window is an exact copy taken from the Imperial War Museum photograph No C0988 of a Mark 1 tank, showing a most unusual feature… the drum or bobbin arrangement which can be seen above the cradle of the tail wheels. Does any reader know what this device is for?..” extract from a letter to The Tank, 1969 But the man that shall touch them must be fenced with iron 2 Samuel 23 v7

German Aeroplane
German Aeroplane

German aeroplane, believed to be a French built SPAD fighter used by both British and American forces Though they climb up to Heaven, thence will I bring them down Amos 9 v2

Field telegraph tent
Field telegraph tent

There is neither speech nor language, but their voices are heard among them Psalm 19 v3

Captured dugout
Captured dugout

Though they dig into Hell, thence shall my hand take them Amos 9 v2