You must use the slider to select troops to go and help defend another base. The traveltime indicated will always be based on the speed of the slowest unit.The troops will be deployed when you tap the “Support” icon.

External troops are listed separately in the troop overview of a base and, once they have arrived, they can be recalled at any time. It can be very useful to send troops to other bases, for example after capturing a base or in the event of an imminent attack.