SINGAPORE (Reuters) -India switched tactics after suffering losses in the air on the first day of conflict with Pakistan earlier this month and established a decisive advantage before the neighbours announced a ceasefire three days later, India's highest ranking general said on Saturday. The heaviest fighting in decades between nuclear-armed India and Pakistan was sparked by an April 22 attack in Indian Kashmir that killed 26 people, most of them tourists. New Delhi blamed the incident on "terrorists" backed by Pakistan, a charge denied by Islamabad.