Each engineer team have 4 satchel charges use for demolition action and 2 materials for construction action. They can build some fortifications (sandbag, open bunker, tank trap.) Each construction consumes 1 material. They can demolish hedgedrow, tank trap and terraform the forest/jungle. It costs each time one satchel charge.
A new object appeared on the map: the reserve of material to recharge a team of engineers.
Transport ships can load material in ports and unload it on the beaches: