Streams do engineer units help in crossing streams?

[pavane]

Hi
do engineer units help other units in any way at all in getting across a stream?

Gent: 

Engineers can build bridges across streams. A bridge reduces the movement cost to cross stream hex sides.

Bridge Building
Bridges may be built across river, stream, gully, canal, and anti-tank hexsides.
Only Engineer units identified as a Bridge Eng unit in the display when you
right click on the unit picture can build bridges. It costs non-Bridgelayer
Engineer units their full movement allowance to initiate building a bridge. Thus
they may not move or fire in the same turn they initiate bridge building. For
Bridgelayer units, it costs 1/3 of their movement allowance to initiate bridge
building. The Engineer unit must not be Disrupted or Broken, cannot be in
Travel or Rail Mode, and cannot be Digging-In. - Pg. 54 PzC User Manual.