At the start of World War II, the 1st Battalion embarked for France as part of the BEF. Forced into the retreat which was to end at Dunkirk, they never made the road to freedom. After a desperate defence across the Bethune-Merville road, at Le Paradis, and after suffering appalling losses, many were taken prisoner and few escaped home. The 2nd Battalion, based in Hong Kong, saw action when the Japanese attacked in December 1941. Here too, The Royal Scots fought like tigers but the result was inevitable. The 1st Battalion was reconstituted after Dunkirk and took part in the Arakan campaign in Burma in 1943 and the Battle of Kohima in 1944. A new 2nd Battalion (originally the 12th) was formed in May 1942 and served in Italy and Palestine whilst the 7th/9th and 8th fought in Europe after D-Day.
There were only 4 Service Battalions in WW2 (or 6 if the reconstituted 1 and 2 RS are included).
Hope this helps
H