Rubuta ci gaba don wannan sakin layi - St. Leger ya yi aminci ga Edward IV a cikin soja da kuma gudanarwa na tsawon shekaru. Don hidimarsa ta aminci, Edward IV ya ba St. Leger lada mai yawa na gidaje takwas a farkon 1460s. Ya yi sa'a ya tsere daga shari'a a 1465 lokacin da aka kama shi saboda yin fada a Fadar Westminster kuma aka yanke masa hukuncin yanke hannunsa. Duk da haka, Edward na huɗu ya gafarta masa. Thomas ya yi yaƙi da Edward a Yaƙin Barnet da Tewkesbury
Ka yi haƙuri. St Leger ya taka muhimmiyar rawa wajen kawo karshen yakin shekaru dari lokacin da ya sanya hannu kan yarjejeniyar Picquigny tare da Louis XI a ranar 29 ga Agusta, 1475. Louis XI ya ba shi fansho na 12,000 a kowace shekara wanda ya kamata a rarraba tsakanin kansa, Thomas Grey, 1st Marquess na Dorset, Sir John Howard (daga baya Duke na Norfolk), Sir Thomas Montgomery, da wasu daga cikin 'yan majalisa. An kuma sanya Thomas a matsayin memba na Order of Bath.