Great question — answering as the UphillTech team:
There's two real links. First: "When Johnny Comes Marching Home" is also known by another name: "Johnny I Hardly Knew Ye." In both versions of the song, more the second, Johnny is a man who has returned from war...missing many pieces. The song strips away piece by piece of his body, leaving him a lump. The one who he comes back to is left angry, resentful, and hurtful. "Ye haven't an arm and ye haven't a leg, haroo, haroo." The tie-in there to Die Hard With A Vengeance relates partly to the way the enemy (Simon) picks away at him to try to win (the guards, the false leads, etc.) and partly to the fact that Simon is angry, vengeful over his loss of his brother. The interesting thing is that...
Full answer by dglickler: https://movies.stackexchange.com/a/17026 (CC BY-SA 3.0).
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