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Nouns for groups of soldiers include:
A company of soldiers
A division of soldiers
A muster of soldiers
A platoon of soldiers
A phalanx of soldiers
A troop of soldiers
A squad of soldiers
An army of soldiers
A brigade of soldiers
Soldiers is a noun; a plural, common noun.
Collective nouns for soldiers include:
A boast of soldiers
Fallen soldiers are soldiers who have died in the line of duty.
An army of soldiers or a troop of soldiers or a platoon of soldiers.
The collective noun for a group of soldiers could be:
Platoon of soldiers.
Troop of soldiers.
Patrol of soldiers.
Squad of soldiers.