I don't think Hitler had a funeral... and I'm pretty sure Michael Collins didn't set it up... there'd have been a song about it.

In a burning Berlin bunker, where a dying Fuehrer lay,
Michael Collins stood beside him, ere his soul should pass away,
And he faintly murmured Michael, as he grasped him by the hand,
Tell me Michael while I'm dying, shall my soul pass through Ireland?