Herbert Charles Tippet War I engaged in second-line duties but that was to change in the spring of 1916 when he was to see action for the first time. On 24 April 1916 the Easter Rising occurred in Dublin and the following day, Tippet's Battalion was one of a number of units sent in to suppress the uprising. They forced their way into the centre of Dublin and fought the insurgents along the railway line from Broadstone Station to Cabra Bridge. After the rebels withdrew, 4th Battalion formed a cordon around the area until the rising ended. Shortly after, Tippet left Ireland. The
Karl Radek Left, with which he had close links from his time in Germany, introducing him to Paul Levi at this time. He took part in the Zimmerwald Conference in 1915, siding with the left. During World War One, Radek engaged in polemics with Vladimir Lenin over the subject of the Irish Easter Rising of 1916; while Lenin was strongly enthusiastic about the Rising, seeing it as a blow to English imperialism, Radek disagreed. Basing his view on Theodore Rothstein (a Jewish emigre from the Russian Empire, living in London), he claimed that, what he called the "Sinn Féin movement" was petit-bourgeois