Thien Bien Phu

[Warhorse]

[font=Roboto, "Helvetica Neue", Arial, sans-serif]Hello I am playing Dien Bien Phu I have a question, I am on the mission that the French escape up the river by boat, what did Vietnam do? I see that there are troops that have a trumpet, what is it for? to warn that the French are escaping? How do I block them?[/font]

Welcome!! The trumpet is a motivator weapon, 

a Motivator weapon is denoted by three plus signs (+++)
in the unit picture. A Motivational Weapon when carried by a
Leader of the same side as the weapon provides that leader with
additional ability to lead his men. When a Leader with a Motivator
weapon attempts to Rally, 1 is added to their Quality value.

This from the user manual, page 51, Motivational Weapons.