Slitherine

I don't understand the way my troops can board a ship. I've read the manual and yes, my troops are adjacent to a port when starting a turn. Do I need a special ship, is there a button for boarding ?
I am a newbie in war games, thanks for your help.

There is a button next to the button to board a train. Your unit changes into a ship until it unloads. You cannot board if you have moved, and you must be adjacent to a port and not adjacent to an enemy unit.

Henri

Its the button next to the rail move button and if you're playing vanilla garrisons can not move by transport

Thanks for your help !

Actually you can board a transport when adjacent to a land unit as long as the port is completely surrounded by naval units (friendly or foe).