battalions

platoons

Soldier groups under lieutenants

• companiesBusiness entities
• divisionsSeparate portions of something
• corpsMilitary unit or group

squadrons · regiments · brigades · detachments · contingents · garrisons · formations · squads · sections · units

troops

Military personnel collectively

• infantrymenGround combat soldiers
• soldiersMilitary personnel who fight
• warriorsPeople engaged in battle

combatants · fighters · guardsmen · grunts · riflemen · grenadiers · fusiliers · marines · paratroopers · commandos

formation

Creation or arrangement

• maneuverDeliberate tactical movement
• flankSide of body
• vanguardForemost position or group

rear guard · advance · column · line · wedge · assault · offensive · defensive · encampment · march

armies

Organized military forces

• hordesVery large crowds
• legionsGreat many, or armies
• massesBulk or populace

multitudes · swarms · throngs · droves · crowds · ranks · waves · forces · hosts

• French Infantry WWIIfoot soldiers, riflemen, infantry units, platoons, regiments
• armyinfantry, cavalry, soldiers, artillery, officers
• militarysoldiers, army, troops, officers, navy
• World War Itrenches, trench warfare, eastern front, Western Front, soldiers
• armiesdivisions, corps, soldiers, platoons, regiments
• military forcesarmy, allied forces, soldiers, troops, coalition forces