The first conflict between Moldavia and the Ottoman Empire for which there is a historical account occurred during the reign of Alexandru cel Bun, in 1420, when the Ottomans tried to capture Chilia. The attack was unsuccessful.

Quick Facts Date, Location ...

Moldavian–Ottoman Wars
Date 1473–1479 and 1484–1486 Location Wallachia, Moldavia, and Transylvania, present-day Romania, Moldova, and Ukraine Result Ottoman victory Moldavia becomes an Ottoman tributary state for more than three centuries (since 1499 a vassal state)
Belligerents
Moldavia Transylvania	Ottoman Empire
Commanders and leaders
Voivode of Moldavia most notably Alexander the good, Bogdan II, Stefan the Great, and John III the Terrible	Mehmed the Conqueror Bayazid II Hadım Suleiman Pasha
Strength
Varied greatly during the centuries ~20,000 active men[1] – 60,000[2]	Varied greatly during the centuries Capable of raising more than 100,000 men
Casualties and losses
Unknown	Unknown

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In 1439, King Sigismund of Hungary argued with King Wladislaw of Poland about dividing Moldavia between their two countries. Sigismund complained that the Moldavians refused to aid him in his expeditions against the Turks, but King Wladyslaw argued that the Moldavians couldn't aid Sigismund with troops because they aided him, instead, and Sigismund had to give up on his claims.^[3]

In 1444, Moldavia sent troops that joined King Władysław III of Varna at the Battle of Varna. The Turks had camels with them and in case of defeat, they would spill gold and silver coins on the ground in order to slacken the enemy. The Moldavians went after the camels for the money.^[4]

Between 1451 and 1457, Moldavia was in civil turmoil and under Petru Aron, the principality paid the Porte an annual tribute of 2,000 gold coins. In 1470, during the rule of Stephen the Great, the relationship between Moldavia and the Porte became hostile, and resulted in several confrontations, most notable being the Battle of Vaslui, where the Ottomans were heavily defeated, and the Battle of Valea Albă, where Mehmed II was victorious, but was forced to retreat. In 1484, the Ottomans managed to annex Chilia and Akkerman. After the death of Stephen the Great, 1504, Moldavia fell into decline and was forced to accept vassalage for the Porte in 1512, but conflicts continued to rage until the 19th century, giving the country brief periods of independence.