（5） if， during the currency of the contract， there shall be an outbreak of war， whether war is declared or not， in any part of the world which， whether financially or otherwise， materially affects the execution of the works， the contractor shall， unless and until the contract is terminated under the provisions of this clause， continue to use his best endeavours to complete the execution of the works. provided always that the employer shall be entitled at any time after such outbreak of war to terminate the contract by giving written notice to the contractor and， upon such notice being given， this contract shall， except as to the rights of the parties under this and to the operation of 37 hereof， terminate， but without prejudice to the rights of either party in respect of any antecedent breach thereof.
（6） if the contract shall be terminated under the provisions of the last preceding sub- clause， the contractor shall， with all reasonable despatch， remove from the site all constructional plant and shall give similar facilities to his sub - contractors to do so.
（7） if the contract shall be terminated as aforesaid， the con -tractor shall be paid by the employer， insofar as such amounts or items shall not have already been covered by payments on account made to the contractor， for all work executed prior to the date of termination at the rate and prices provided in the contract and in addition：
（a）the amounts payable in respect of any preliminary items， so far as the work or service comprised therein has been carried out or performed， and a proper proportion as certified by the employer of any such items， the work or service comprised in which has been partially carried out or performed.
（b）the cost of materials or goods reasonably ordered for the works which shall have been delivered to the contractor or of which the contractor is legally liable to accept delivery， such materials or goods becoming the property of the employer upon such payments being made by him.
（c）a sum being the amount of any expenditure reasonably incurred by the contractor in the expectation or completing the whole of the works insofar as such expenditure shall not have been covered by the payments in this sub - before men - tioned.
（d）any additional sum payable under the provisions of sub- clauses （1）， （2） and （4） of this clause.
（3） the reasonable cost of removal of constructional plant under sub- （7） of this and， if required by the con - tractor， return thereof to the contractor'' s main plant yard in his country of registration or to other destination， at no greater cost.