Troubled ferrying infantry ...

[Mr Grumpy]

Take the unit out of bridge ops, ferry your units over and then put the engineer unit back to bridge ops, the downside is that you are restarting the pontoon building exercise each time you do this (assuming you are trying to cross the full hex river), if possible i like to have two engineer units in a crossing hex, one to build the bridge and one to ferry troops.

It should be noted that the rules for ferrying and bridge building across a hexside river and a full hex river have important differences. ;)