Ka cika wannan magana: St. Leger ya yi wa Edward IV hidima cikin aminci a matsayin soja da kuma na gwamnati na shekaru da yawa. 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 yakin 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.