What is the fine-grained topic of the following text: Nairn and myself should be allow'd to return on Parole within the British lines when our health permitted, We with the greatest sincerity thank you for your kind indulgeance, and although we be unacquainted whether it be your intention that we only remain for a limited time with our friends, or that we send out any two regular Officers of Equal rank you may be pleased to specify, we earnestly wish, tho' our health be not yet entirely reinstated that you would take the trouble to put us in possession of whatever Parole you may judge expedient, least the fortune of War, by depriving us of your presence may robb us of these little pleasant Scenes of Happiness we have formed to ourselves in seeing our Friends, and once more enjoy liberty was it but for a short time. Only return the topic.
Request for parole within British lines during war time.