When demand is made of a county treasurer for the payment of an execution against the county and there are not funds in the treasury sufficient to satisfy such execution, such treasurer shall forthwith issue the certified statement required by 32 V.S.A. § 4965 and shall issue warrants to the several treasurers of the towns for the collection of a tax sufficient to pay such execution, the charges thereon, 12 percent interest, and other incidental expenses, returnable within 60 days from the date of such warrants.