https://www.freepressjournal.in/india/who-was-sardar-udham-singh-know-interesting-facts-about-the-man-who-avenged-jallianwala-bagh-massacre
In the premises, Udham Singh brought a revolver hidden inside a book. The pages of the book were cut in the shape of the gun to hide it properly.
sardar udham singhinteresting factsknow