Mackay's Crusade coverage the result of a failed novel?
Mackay must have a taste for military history. He could have just made the chapter about The Crusades in his The Madness of Crowds a brief 40-60 page affair about religious zealousness and the extremes to which it can push people. Instead, he's using this extensive chapter not so much to cover such madness...
The madness of The Crusades? More like Mackay's novel notes
At over 100 pages, Charles Mackay's chapter about The Crusades seems like it's less about religious zealotry and more of a military history. Maybe from notes Mackay had made for a never seen novel?