This was taken from another post on my site...
The goals set for the Brittany ports were never realized and at most of them the engineer effort was considered "utterly wasted." Despite the heavy emphasis on those ports in July, the breakout from the bridgehead and the headlong drive across northern France moved the action far from Brittany by September. This development caused logistical planners at SHAEF to regard Antwerp as the major prize; engineers nevertheless expended considerable effort in Brittany before the tactical situation changed so drastically. The 1053d Port Construction and Repair Group and the 360th Engineer General Service Regiment worked on St. Malo, Cancale, and St. Brieuc before moving into captured Brest. The St. Malo project halted just as it neared completion, primarily because the task of reopening waterways south and inland from St. Malo did not appear worth the effort required. Some port-operating personnel went to Cancale, but tidal conditions there proved so difficult that the port was never used. St. Brieuc opened in mid-September but operated for only a month, averaging 317 tons a day, mostly coal for local generating plants and railroads. St. Michel-en-Greve did somewhat better, averaging 745 tons a day; but it closed down on 1 September, never contributing more than a small amount of port capacity and reverting to French control in mid-December. The only ports in Brittany that delivered more than token tonnages were Granville and Morlaix.
Proud Daughter of Walter (Monday) Poniedzialek
540th Engineer Combat Regiment, 2833rd Bn, H&S Co, 4th Platoon
There's "No Bridge Too Far"