When Gawain's ghost warns Arthur not to fight, how does Arthur react to the warning?

While appearing in a dream, Gawaine warned Arthur to avoid the battle at Salisbury, for Arthur would die if he fought his son. Gawaine told him to postpone the battle for a month, until Launcelot arrived with additional forces.

The next day, Arthur told his council of the dreams, and all agreed they should postpone the battle. Arthur sent two brothers, Sir Bedivere and Sir Lucan the Butler, to offer Mordred lands and goods in exchange for a month's peace. Mordred agreed to the terms, and was given all of Cornwall and Kent for it.