This tutorial will teach you about combat in the game Civilization Beyond Earth (CivBE)
Introduction
One of your military units is near an enemy unit. To attack, order a combat unit to move into a tile occupied by the enemy. In combat, both the attacking and defending units may take damage, and if already weak, they could be destroyed.
Tutorial
1. To attack an opponent, select your unit by left-clicking on it.
2. With your unit selected, hover your mouse over your opponent for a combat preview (including all combat bonuses).
3. If you're sure about attacking after reviewing the combat preview, right-click on the opponent to attack.
Tips
Make sure to keep a military near your capital for defense.