 of this policy. If the expenditure incurred by the insurer shall include any amount for which the insured is responsible hereunder such amount shall be repaid by the insured to the insurer forthwith. For the purpose of this Endorsement the expression "event" shall mean an event or series of events arising out of one cause in connection with the vehicle insured in respect of which indemnity is provided under this policy. Subject otherwise to the terms conditions limitations and exceptions of this Policy. * 