Another example of quantity beating quality is the whole of the Vietnam War (American War to the Vietnamese).

The NVA and Viet Cong had very few advanced weapons (mostly AK-47s, WWII era machine guns, and some arty pieces).  Yet, they had the numbers and the motivation.  They beat the Americans who had all the advanced weapons (M60 machine guns, gatling guns, helicopters, fighter planes, etc).   America expected to go in there and beat the NVA/VC easily with the technological advantage.  Another thing that did the American war effort in was the politicians that felt that there needed to be rules of engagement and that the war should be run from DC.  Rules of engagement are not necessarily bad but the number of rules and the kinds of rules emplaced were poorly thought out, especially those dictating what special forces could and could not do.

The Americans made the same exact mistake that the French made 10 years earlier.  There were a few good programs that got cut by the politicians (i.e. CAPs and special forces having pretty much autonomy).