Editing 1799 (section)

=== April–June ===
* [[April 16]] – [[French Revolutionary Wars]]: At the [[Battle of Mount Tabor (1799)|Battle of Mount Tabor]] severely outnumbered French forces repulse an [[Ottoman Empire|Ottoman]] attack.
* [[April 27]] – [[French Revolutionary Wars]]: The [[Battle of Cassano (1799)|Battle of Cassano]] takes place outside of [[Milan]], as Russian and Austrian troops commanded by General [[Alexander Suvorov]] rout the French Army under the command of General [[Jean Moreau]].
* [[April 28]] – Two French diplomats to the [[Second Congress of Rastatt]] are killed and another badly injured by Austrian cavalry, as they tried to leave the town. An inquiry was held, which blamed French emigres. 
* [[May 4]] – [[Battle of Seringapatam]]: [[Tipu Sultan]] is defeated and killed by the British; the [[captivity of Mangalorean Catholics at Seringapatam]] ends.
* [[May 21]] – The [[Siege of Acre (1799)|Siege of Acre]] ends after two months; [[Napoleon]]'s attempt to widen his Middle Eastern campaign into Syria is frustrated by Ottoman forces, and he withdraws to Egypt.
* [[May 27]] – [[Battle of Winterthur (1799)|Battle of Winterthur]]: [[House of Habsburg|Habsburg]] forces secure control of north-east Switzerland, from the French [[Army of the Danube]].
* [[June 7]] – Four days of fighting ends in victory for [[Archduke Charles]] and the Austrian army over the French army under [[André Masséna]] at the [[First Battle of Zurich]]
* [[June 13]] – [[Ferdinand I of the Two Sicilies]] is restored to his kingdom following the collapse of the [[Parthenopean Republic]].
* [[June 17]] – [[War of the Second Coalition]]: [[Battle of Trebbia (1799)|Battle of the Trebbia]] – The beginning of the battle that marked the debacle of [[Étienne Macdonald, duc de Tarente|Étienne Macdonald]]'s French army. [[Suvorov]] scores a comprehensive victory.
* [[June 18]] – [[French Revolutionary Wars]]: [[Action of 18 June 1799]] – A French frigate squadron, under Rear-admiral [[Jean-Baptiste Perrée|Perrée]], is captured by the British fleet under [[George Elphinstone, 1st Viscount Keith|Lord Keith]], off [[Toulon]].