I'm certain the Black Family version says 'one line'. It makes more sense.

For those who enjoy this kind of thing, Napoleon's migrains may have been the reason the Russian campaign was such a disaster. He was a life long sufferer of severe migrains. During a migrain, blood vessels in the brain swell and, after years of this, some mental deterioration often occurs. In preparing for Russia and in reaching Russia, there were a number of standard logistic precautions Napoleon failed to take; ie, field hospitals that did it, protected supply lines, supply dumps, ammo dumps and such. France suffered greatly for this. Some historians think it was migrain dementia that did it.