War is hell and so is a certain type of war movie: bloated, self-important and glassy-eyed with solemn patriotism. Directed by action veteran Tsui Hark, The Battle at Water Gate Bridge is the giant follow-up to China’s colossal military epic and domestic box-office smash, The Battle at Lake Changjin. It revives the tale of how, during the Korean war in the unimaginably cold winter of 1950, the Chinese army took on the US forces in Changjin county in North Korea and forced Uncle Sam to retreat towards the 38th parallel,…