The &lt;a href="2nd%20Sussex%20Rifle%20Volunteers%231/4th%20Battalion"&gt;1/4th Battalion&lt;/a&gt; joined 160th Brigade in 53rd (Welsh) Division and landed at Suvla Bay in August 1915. After the Gallipoli campaign it was evacuated to Egypt and later served in Palestine, where it saw action at the battles of Gaza and Jerusalem. It moved to France in May 1918 for service on the Western Front in 34th Division. The &lt;a href="5th%20Royal%20Sussex"&gt;1/5th (Cinque Ports) Battalion&lt;/a&gt; landed in France as Army Troops in early 1915, seeing action from the Battle of Aubers Ridge with 1st Division in May 1915. It later joined 48th (South Midland) Division as divisional pioneers, seeing action at the Somme and Ypres before moving to Italy in November 1917. The &lt;a href="6th%20%28Cyclist%29%20Battalion%2C%20Royal%20Sussex%20Regiment"&gt;1/6th (Cyclist) Battalion&lt;/a&gt; remained on coast defence duties in England and Ireland for the whole war, but the 2/6th was converted to infantry and saw action with 16th Indian Division in Waziristan in 1917–19.