Heavier equipment was brought up by well organized supply trains. Wagons and carts carried, amongst other things, large stockpiles of arrows. The main logistical factor limiting their advance was finding enough food and water for their animals. This would lead to serious difficulties during some of the Mongol campaigns, such as their conflicts with the Mamluks, the arid terrain of Syria and the Levant making it difficult for large Mongol armies to penetrate the region, especially given the Mamluk's scorched earth policy of burning grazing lands throughout the region. It also limited the Mongol ability to exploit their success following the Battle of Mohi, as even the Great Hungarian Plain was not large enough to provide grazing for all the flocks and herds following Subutai's army permanently.