Which of the following district of Karnataka holds the sobriquet “Cradle of Infantry”?

Belgaum
Belgaum in Karnataka is known as Cradle of Infantry. It served as a military base during the British Era and also after independence. The key reasons as to why British selected Belgaum as military base include its salubrious climate and proximity to Goa, which then was in hands of the Portuguese. After India’s independence, the Indian operations against Portuguese in Goa were launched from Belgaum only. Its strategic location also allowed to choose it as a suitable location for an army training centre and cantonment which continues to be today for Indian army. Further, it has an air force station and naval station also.