Just to add a tidbit to the intro.

SSR who was booked to act alongside NT in 'Veera Pandiya Kattabomman' (1959) refused to proceed with the shooting. Gemini Ganesh had to replace him. NT was furious with SSR over this. He was given the impression that SSR chickened out due to the war subject where heavy fighting was involved. However, SSR did another film produced by Kaviarasar Kannadhasan ('Sivagangai Seemai') on almost the same subject simultaneously.

This bad blood between NT and SSR existed until 'Shanti' (1965). It was only after 'Shanti' that they resumed 'normal' relations. In between they had acted in films like 'Deiva Piravi' (1960), 'Kai Kodutha Deivam' (1964) but they were not on talking terms!