The shortest war in history was between Britain and Zanzibar on August 27, 1896 - Apparently.
The Anglo-Zanzibar War, also known as the Shortest War in History, lasted a mere 38 minutes. The war was sparked when the pro-British Sultan Hamad bin Thuwaini died, and the opposing party, Khalid bin Bargash, seized power. The British launched a naval attack, and Khalid refused to surrender, leading to the brief but intense conflict. The war ended with Khalid's defeat and the signing of a peace treaty, marking the beginning of British colonial rule in Zanzibar.