Which Pakistani military operation is widely considered to be the precursor or a major contributing factor to the outbreak of the 1965 Indo-Pak War?

Explanation

Operation Gibraltar was a covert operation launched by Pakistan in August 1965 to infiltrate irregular forces into Indian-administered Jammu and Kashmir, aiming to incite a rebellion against Indian rule. India's counter-actions against this infiltration escalated into the full-scale 1965 War.