Engineer withdrawn - what happens to the bridge?

[Green]

I have heard they have a Manual for these Games.........   

Thank you for your helpful comment. Please direct me to the page of the User Manual which addresses my question.

If an engineer with a bridge is withdrawn, the bridge is removed. Effectively the engineer has abandoned the bridge. In game terms, an abandoned bridge ceases to exist. This situation is not explicitly covered in the Manual but can be inferred from the Abandoning Bridges section. The bridge can never exist independently of the engineer.