 However, he also criticised them for not putting in their best to govern a small state like Shu and keeping it safe.The fifth-century historian Pei Songzhi, who annotated the "Sanguozhi", disagreed with Chen Shou's point of view.He argued that Jiang Wan and Fei Yi did well during their regencies when they refrained from making risky moves that could jeopardise Shu's future and when they successfully countered a Wei invasion and maintained peace within Shu's borders.