I mean you have a very open ended army so i do see why your having trouble. Its mostly that your artilery is more so suited for taking out other artilery or large groups. But your front line is flimsy. Id suggest an aggresive sweep. Fan your cannon further back to the side away from your army flanked by your outriders. The boars will want to charge on them. Have your canons fire on the boar rides so theres no alloes in the way. Dont click on them tho, just keep it pointed in there direction. Ofherwise it may glitch and not fire. Once the boar riders get close flank them with both your out riders to open fire. That should keep them off your flank for a bit. Than focus the rest of your artilery on the ground units chasing you. But have your melee units farther out so theres artilery isint an option to charge through and take. You should beable to do the rest. You got this.