Bogdan -- sorry to ping on you as a non-native speaker, but this is too good to pass up. Alamein was where Montgomery finally was able to use his vast material and intel superiority to beat Rommel in 1942. Alamo is where a couple dozen Texans got their asses kicked, gloriously, by thousands of Mexican regulars in 1836; it's about to be a subject of a nihilistic, revisionist film from (who else?) Disney.
Archy: mondegreen alert!
d.o.l.
Criminal Number 18F
It's got to be a song lyric for it to really qualify as a Mondegreen, and the nearest song I can think of akin to a couple of pretty fair Alamo ballads [most notable being the Marty Robbins version] being *Dirty Gertie from Bizerte*
Better described as a mixed metaphor, I'd think, or in this case, maybe a mixed similie.