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 demonstrate how Peyton Farquhar's character is influenced by his desire to contribute to the war effort and his longing for the experiences and challenges associated with being a soldier, reflecting how war impacts individuals beyond combat.