s23021536: You use your call to arms spell. Two things though.
1.) Click and hold to increase the level of the spell 1-9. The higher the level the further away it attracts your minions. If you just click normally then it will be at level 1 and your creatures will have to be pretty close to respond to it.
2.) It costs quite a bit of money to maintain the spell in enemy territory so be sure to check your gold reserves.
Otherwise you could use the barracks room. If you place a bunch of creatures in the barracks room and possess one
of the creatures then the other creatures will follow you into combat. There could be a limit on how many creatures you can lead like that but I am not sure.
I am more than ten years playing this game and was never fully sure about what the hell the barracks did apart from attracting the Orcs! Thanks. :D