Israeli Prime Minister Benjamin Netanyahu said Saturday “we are at war, and we will win it” after the Islamist militia Hamas launched an assault and took captives following the 50th anniversary of the start of the 1973 Yom Kippur war. The confrontation, which has killed at least 40 Israelis and injured at least 740, is one of the most serious in years after weeks of rising tensions along the volatile border. Israeli air force strikes killed nearly 200 people on the Gaza Strip and injured 1,600, according to the Palestinian Health Ministry. Israeli authorities said that an unknown number of Israeli civilians, soldiers and commanders have been taken captive by Hamas.