A troop (of military personnel) is a group, as is a:
band
battalion
command
company
corps
detachment
division
platoon
regiment
squad
unit (as in, cavalry unit, infantry unit, and so on).
These units are listed in alphabetical order, not in order of size.
The link below has more information on military units.
they are called troops
No, they are not called either a herd or a pack. A group of monkeys is called a troop.
A group of girls in Girl Guides and Girl Scouts are called troops.
"Last stand" is a military term used to describe a group of troops holding a defensive position while facing overwhelming odds, and the majority of soldiers are killed.
The southern troops were called rebels, or Johnny Reb.
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A group of gorillas is called a band or a troop.
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A group of drunk colonists were throwing rocks and snowballs at the troops, and one of them hit one of the troops with a club, so he shot him. Then, some of the other troops fired at the group of drunks and they killed five people.
Depending on the national organization, Brownie Guide or Girl Scout groups are called Packs, Troops, Groups, or Companies. Smaller groups of Brownie Guides or Girl Scouts are called Patrols or Sixes.
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Common nicknames were "redcoats" for British troops and "Yankees" or "colonials" for American troops.