I'm not an expert in the time period, but at least most of us know about Napoleon Bonaparte's disastrous campaign in Egypt.
But nappy had another option at the time: British-controlled Ireland. The island was going through a rebellion in the year of 1798, and it was getting crushed without major support. There was a french effort to support the rebellion, but it was too disorganised.
What if Napoleon decided to postpone or just cancel his plans of curtailing british access to the Red Sea and to their colonies in the Indian Ocean, instead concentrating his efforts into creating an independent irish state breathing right on the british metaphorical neck?
-Could his supplies and soldiers have possibly relieved the war effort in the island?
-Could Ireland become independent for a lasting future with success?
-How would such an invasion affect the napoleonic wars?
-How would the british react to such a situation?
-What kind of armaments would Napoleon require for such an invasion? Could Robert Fulton be involved in the invasion, with his inventions? Is there a competent general, terrestrial or naval, to help Napoleon in the invasion?