Im not really surprised that you couldnt find it, but I can copy the lines that or relevence.
A On-the-run french soldier is captured by a German corporal and taken to a known collaberators house. However she is a double agent, and helps escapees and the like escape to freedom. In the play the soldier pretends this collaberator is his aunt, to fool the german. After the German leaves, the soldier (Stranger) and the french madame talk, to try and help the stranger
madame - But of course I have a nephew. I tell lies, my friend, but not silly lies. My charming nephew has gone to Bonneval for the day. He finds country life dull.
Stranger - Dull? This - this Heaven?
Madame - (dryly) He likes to talk, and here there is no audience. At the Headquarters in Bonneval he finds the audience sympathetic.
Stranger - (Understanding the implication) Ah
Madame - He blelieves in the Brotherhood of Man - If you can credit it
Stranger - After the last six months?
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On the next page they continue their discussion
Stranger - If your nephew is so friendly with the Invader, how come the coporal doesnt know him by sight?
Madame - (absently) The unit at St Estephe is a non commissioned one
Stranger - Does the Brotherhood exclude sergents then?
Madame - Oh definetly. Brotherhood does not really begin under field rank, I understand.
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Hope this helps snailman, taken directly from the text