It is incredibly tempting in Europa Universalis 4 to simply recruit as many soldiers as you can, send them off into your latest war, and then hope for the best. Unfortunately, doing this is likely to get your army wiped out by more attentive players or even the AI if it's deciding to work on this particular day.
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Army composition is important in EU4. The game takes a lot of things into account when calculating the outcomes of a skirmish
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