A Purchasing Department truck withdraws from the Lawn after defending the sidewalks against hordes of pedestrians and bicyclists early yesterday afternoon. The truck, which blockaded a strategic section of sidewalk in front of Cooke Hall, was apparently engaged in moving furniture, but succeeded in executing a secondary tactical objective by interdicting the supply lines for classes in Cabell Hall. The flow of traffic along the Cabell Hall Trail was reduced to a trickle, and the wet season near the grass-sprinklers blocked the alternate route.