September 23 1918, Haifa–British cavalry had advanced dozens of miles since the 19th, destroying the better part of two Turkish armies. So far, they had been able to find water and fodder for their horses from the large amount of territory captured, but supply was still becoming a concern. Bringing supplies over such a long distance by land would be quite difficult, so it became a top priority to secure the seaports at Acre and Haifa to land supplies by sea. Acre would fall quickly, but Haifa was a more difficult matter. An attempt to secure it with armored cars on the evening of the 22nd failed, driven back by an Austrian battery on Mount Carmel and German machine gun fire. The next day, British cavalry and armored cars made another attempt. Maneuver was difficult due to marshy ground, and many horses were killed while attempting to get around it.
Despite their weakened state, the Mysore and Jodhpur Lancers was able to charge the German machine guns and quickly overwhelmed them; while many of the horses were mortally wounded during the charge, they were still able to carry their riders to their objective. Another uphill attack by the Mysore Lancers took the Austrian battery on Mt. Carmel, and Haifa was taken soon thereafter. Only three Allied soldiers were killed in the fighting. The victory, involving one of the final successful cavalry charges in history, is still celebrated by the Indian Army as Haifa Day.
Sources include: Cyril Falls, Armageddon, 1918; Roger Ford, Eden to Armageddon; The Indian Express (includes image credit).