Very good and expands nicely on canon.
Two small points to consider though. Elblag was levelled in the war, probably by nukes due to it's speciality in heavy machinery and position as a transportation hub. This isn't to say it wouldn't still have been important to the 8th ID as a crossing point, but nobody would want to hang around in the ruins very long (the Marines could set up somewhere in the outskirts rather than heart of the city).
Given the damage to the city, it might be argued that a bridging unit is attached to the marines? This would allow the 8th to still cross (as they had to in this area given there's a swamp to the south and Pact units to the other side of that), while also minimising the need for significant defensive forces to be stationed in the city (bridges downed). Something like truck carried Bailey bridges would suffice I'd think, removing the need to add more armoured vehicles to the mix (M-60 AVLB for example). The bridge components could even have been fabricated by XI Corp engineers in the months leading up to the operation for just that purpose (if there weren't any already on hand).
http://en.wikipedia.org/wiki/Bailey_bridge