how do i attack bandits

i have military but i didnt find any option to attack bandits

assign troops to your general by clicking on the garrison and moving the sliders to assign the troops. After assigning some troops click attack. Click the camp you want to attack paying close attention to the pathing your general will take. if he crosses over a different enemy camps red box (aggro zone) he will attack them first. to see a camps aggro zone (and what is in that camp) click on the enemy camp. to see if you will actually win the battle see here

It is important to note that you can move the troop sliders all you wish but UNTIL you click "OK" those troops will not be assigned to a general. This small issue led to me losing troops. Please be sure you've not only chosen the troops you wish assigned but also clicked "ok".