how to build medium bridge

[Armored Inferno]

As I recall it: select the bridge building unit, then select "Lay Vehicle Bridge" from Menu bar. There is a die roll whether the bridge building succeeds or not.

Make sure you select the correct hex side the Lay Vehicle Bridge command is targeted at.

Once the unit has laid the Medium bridge, a Out-of-ammo indicator is marked and the unit can build no more bridges for the duration of the scenario.

Okay, got it. Thanks for that info. Seems like a 10% chance or so.