VALLEY - Authorities said arson was the cause of two fires yesterday at the Saha farm, the site of a tug of war where Coatesville wants to condemn the land to build a recreational center and golf course.No one was injured in the fires, which started at 12:30 a.m. yesterday and caused $1,800 in damage to a horse trailer and a barn.Four horses in the barn were led to safety by the family, which used a garden hose to put out the barn blaze as emergency crews arrived to contain the trailer fire.The two fires broke out almost simultaneously 100...