bat ‧ tal ‧ ion /bəˈtæljən/ BrE AmE noun [countable]
[ Date: 1500-1600 ; Language: French ; Origin: bataillon , from Old Italian battaglione , from battaglia 'group of soldiers, battle' , from Late Latin battalia ; ⇨ ↑ battle 1 ]
1 . a large group of soldiers consisting of several companies (↑ company )
2 . a large group of people who are doing something with a particular purpose
battalion of
a battalion of supporters