The two lines from the passage that support the theme "War tests character on and off the battlefield" are:
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"No service was too humble for him to perform in the aid of the South, no adventure too perilous for him to undertake if consistent with the character of a civilian who was at heart a soldier."
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". . .he chafed under the inglorious restraint, longing for the release of his energies, the larger life of the soldier, the opportunity for distinction."
These lines illustrate how Peyton Farquhar's character is tested by his desire for action and service, showcasing his commitment to the Southern cause even when he is not on the battlefield.