Aclea (Danish invasions of Britain), 851

The increasingly deep thrusts of Danish Vikings into Britain brought on the major battle of Aclea (Oakley), south of The Thames. King Ethelwulf, son of Egbert and father of Alfred, deployed his Wessex Army to meet the invaders. In a fierce struggle his men repelled the Danes. The successful defense helped establish Wessex as the premier state among the heptarcial kingdom of Britain. But it was the only major victory of the west saxons over the Danes during Ethelwulf's lifetime.

Abu Klea (War for the Sudan), 1885

Seven months after Gen. George Gordon was trapped in Khartoum by Sudanese Mahdists, a relief expedition left Cairo. Commanded by Gen. Sir Garnet Wolseley, the column pressed up the Nile toward Khartoum, 800 miles away. In northern Sudan, Wolseley sent 1,800-man camel corps under Gen. Sir Herbert Stewart directly accross country, where the Nile makes a great bend to east. At Abu Klea, a caravan stop 63 miles southwest of Ed Damer, Stewart's troops encountered almost 10,000 Mahdist followers of Muhammad Ahmed. In a desperate hand to hand on January 17, the Sudanese were repulsed with more than a thousand killed. Anglo-Egyptian casualties were 168.
Stewart's corps fought its way to the Nile two days later, but their commander mortally wounded. On January 24, the force, now under Lord Charles Beresford, began moving upriver to Khartoum, where they arrive four days later - and 48 hours too late to save Gordon.

Abukir (Wars of the French Revolution), 1979

While Napoleon Bonaparte was withdrawing to Egypt from his repulse at Acre in May 1799, a Turkish expeditionary force of 18,000 men under Mustafa IV landed at Abukir, east of Alexandria, on July 15. Napoleon hurriedly regrouped his Egyptian forces and moved against The Turkish positions on the Abukir peninsula with 7,700 men. On July 25 a fierce French assault cracked the first Turkish defense line in an hour, shattering the force of 8,000 enemy troops. Continuing their artillery-supported attack against the second line the French rolled up the position as well, killing or scattering another 6,000 Mustafha's men. Pressing on up the peninsula, Napoleon destroyed the entire enemy, except except for a few thousand that held out in Fort Abukir until august 2. In all, Turkis losses were 2,000 killed, 10-11,000 drowned trying to escape, and 3,000 captured. French casualties numbered 150 killed and 750 wounded.
Learning that the armies of the French directory had been suffering defeats in Italy and Germany, Napoleon embarked for France on august 22. He left Gen. Jean Kleber to command the army in Egypt.  

Abensberg (Napoleonic Empire Wars), 1809

When the armies of Napoleon I bogged down in Spain, Austria declared war on France for the fourth time since 1792. With 200,000 reorganized troops, Archduke Charles Louis, brother of Emperor Francis I, began crossing the Inn River on April 10, 1809. Marching into Bavaria south to Danube River, Charles hope to trap the III French Corps of Marshal Louis Davout at Regensberg (Ratisbon). Realizing his danger, Davout fought his way 18 miles southwest on April 19 to link up with Marshal Francois Lefebvre's VII Corps at Abensberg. Meanwhile, Napoleon hurried forward from Paris to take direct command. On April 20 he sent provisional corps (25,000) men, commanded by Marshal Jean Lannes, south of Abensberg against the thinly stretched Austrian center. A hard hitting French attach thrust between the wings of Charles army. The archduke's right wing, pull back to Eggmuhl, south of Regensberg, while Gen. Baron Johan Hiller's left wing retreated south toward landshut, on the Isar River. French casualties were few. The Austrian's lost 2700 killed and wounded and 4000 prisoners.

Aachen (WWII)

AThis first German city to fall to allies was captured in bitter fighting between october 13 and 20, 1944