Gotta move that gear up!
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By killing enemies in battle, you charge up a "reserve bar," located in the top right of the screen. Gaining medals charges the meter even more, meaning getting combos can allow you to get more reserves and by extension have a higher chance of winning. When fully charged, the meter will no longer fill up and can instead be tapped. Tapping the meter in this state drains it completely and summons ~10 more normal soldiers to your force. It is nearly impossible to beat a defense without using the reserve bar once, as the starting 9 soldiers or 8 soldiers + mercenary are too little to be able to defeat the onslaught of enemy troops.