The motto on the wall at Chieftain ('Miseram pacem vel bello bene mutari') is from Roman historian Tacitus. It translates as "Even war is preferable to a shameful peace".
Lamb quotes Winston Churchill in this episode ("You cannot reason with a tiger when your head is in its mouth."). Gary Oldman famously played Winston Churchill in the 2017 biographical film "Darkest Hour". Even better, he even says this exact quote in the film.