A - Archer represents the Hundred Years' War between England and France (1337-1453)
B - Borrows represents the Second Boer War between the British Empire and the Boer South African Republic (1899-1902)
F - Five represents World War I (1914-1918)
L - Long represents the Thirty Years' War in Europe (1618-1648)
B - Bows represents World War II (1939-1945)

So, the mnemonic sentence would be:

"Archer Borrows Five Long Bows."
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