The lumbermen retreated leaving behind the five ash trees felled. Strong winds felled downed lines and trees. Omnibuses were turned into barricades, and thousands of trees were felled. Trees are felled using an axe or chainsaw. Tornado-like winds were reported, trees of over diameter were felled and tents came down. Confederates once again felled trees in their path, and willow reeds fouled the boats' paddlewheels. They covered their fox holes with felled timber. Trees are felled and then delimbed and topped at the stump. Root sprouts also may grow from the roots of trees that have been felled. Some of the first man-made bridges with significant span were probably intentionally felled trees. During drought conditions, whole trees have been felled to feed stock. The forests were felled for timber and cleared to make way for cultivation. Wide swaths of forest have been felled by such storms. Tree roosts are often felled and colonies dispersed. Forests have been felled for logging and large agricultural projects.