Though still she stood right up, and never shrunk, But spoke on bravely, glorious lady fair!
As Antony H. Harrison discusses in "Arthurian Poetry and Medievalism," the narrator views Guenevere as both the hero and victim. At these lines, Guenevere's monologue illustrates her bravely against the accusation from Sir Gauwaine as her only support at the moment is herself.
crimson
As Josephine K. Tarvers discusses in her article, "'The Deep Still Land of Colours': Color Imagery in 'The Defence of Guenevere and Other Poems'", Morris uses color imagery to symbolize meaning. The color red illustrates love and lovers, which is used in this line when Launcelot arrives to Guenevere's rescue. Morris, influenced by the traditional color scheme of the Middle Ages, uses colors such as red, green, white, and blue in his works to evoke an emotional response from his readers. https://www.jstor.org/stable/4174266