The 1918 Platoon was 4 x 7 man sections. 2 Gun Sections had 1 x Lewis gun each, and the other sections had Rifles and Rifle grenades. It grew out of what worked in WW1.
The scheme of manoeuvre was formally laid out in the 1919 "Soft Spots" manual. basically, no one moves unless there are 3 sections giving covering fire, and the aim is always to get the gun-sections closer to the enemy.
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