1 [treated as singular or plural] an organized military force equipped for fighting on land:the two armies were in position [as modifier]:army officers
(the army) the part of a country’s military force trained to fight on land:he joined the army at 16
2 (an army of/armies of) a large number of people or things:an army of photographers
you and whose army?
informal used as an expression of disbelief in someone’s ability to carry out a threat:‘One word to him and I’ll have you.’ ‘You and whose army?’