The B-26 played a key part in the airwar, especially against Germany. It was also primarly for the devestation inflicted upon Monte Cassino.
And if anyone thinks the raids against France were unopposed, take a look at the records of the raids against the U-boat bases on the French coast. Or better yet, check out the 2nd B-26 mission over France. All 12 bombers were shot down. Despite that, by the end of the war the B-26 had the lowest loss rate of all American bombers. And it certainly proves that raids over France were very heavily opposed.