Lyric discussion by fftm 

This has always been one of my favorite Genesis songs. I freaked out a little bit when I was reading about World War I, and the text mentioned types of nerve gas artillery shells being 'blue crosses' and 'green crosses' : worldwar1.com/arm006.htm. I thought then that this entire song must be an allegory for the hell of trench warfare. Then again, maybe not.

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