After the first Chindits expedition, thanks to the training the regular forces were receiving and the example of the Chindits and new divisional tactics, the regular units of the Fourteenth Army started to get the measure of both the jungle and the enemy. When the Japanese launched their late 1943 Arakan offensive they infiltrated Allied lines to attack the 7th Indian Infantry Division from the rear, overrunning the divisional HQ. Unlike previous occasions on which this had happened, the Allied forces stood firm against the attack and supplies were dropped to them by parachute. In the Battle of the Admin Box from 5 February to 23 February, the Japanese were unable to break through the heavily defended perimeter of the box. The Japanese switched their attack to the central front but again the British fell back into defensive box of Imphal, and the Kohima redoubt. In falling back to the defensive positions around Imphal the leading British formations found their retreat cut by Japanese forces, but unlike previously, they took that attitude that if the Japanese were behind them then they were just as cut off as the British. The situation maps of the fighting along the roads leading to Imphal resembled a slice of marble cake as both sides used the jungle to outflank each other. Another major change by the British was that use of air support both as an offensive weapon to replace artillery, and as a logistical tool to transport men and equipment. For example, the 5th Indian Infantry Division was airlifted straight from the now quieter Arakan front up to the central front and were in action within days of arriving. By the end of the campaigning season both Kohima and Imphal had been relieved and the Japanese were in full retreat.