It's a diary, some entries as dictation, some as letters written. Difficult to read without having to fill in gaps, history book at the ready. But it's interesting to hear Napoleon's "voice" - alternately boastful and petulant, as dictated by the prevailing tide of war.
Sample - "A man must have accomplished all that I have, to realize fully the difficulty of doing good. It sometimes needed all my power to succeed. If it was a question of extending the Tuileries gardens, of repairing the sewers, of carrying through a public improvement, all my energy was necessary; I had to write six, ten letters a day, and get hot and angry. I have spent as much as 30 millions on sewers which nobody will ever thank me for."