How did wars back in the day work? Would two armies engage each other and each would pick "his guy" and just keep on fighting him?

r/AskHistorians may be helpful for this.

Which day are you talking about?

Depends where in the world and what time period.

That would depend on what period of history and the location of the battle.

CHARGE!!!!! RETREAT!!!!!

In the American Civil War, the combatants would shoot, stab, and beat whomever seemed to be the best target. The battles were called off at nightfall so the wounded could be attended to. If the wounds were able to be treated, the casualty was carted off the battlefield to medical care. If not, the casualty was shot to avoid prolonged suffering.

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thats more or less how i do your mom