In the battle since 1939; became a prisoner of war and was in detention through 1945 (since 27 April 1942 in Oflag VII-A Murnau).
He capitulated with his forces on 26 September 1939 and spent the rest of the war in German captivity in Oflag VIII-E Johannisbrunn and Oflag VII-A Murnau.
After he was liberated from the Oflag VII-A Murnau POW camp in Murnau am Staffelsee, Germany, by the American forces he joined the Polish Army in the West.
King Edward VII | Edward VII | Henry VII of England | Pope Pius VII | Henry VII | Pope Clement VII | Pope Gregory VII | Charles VII of France | Oflag IV-C | Ferdinand VII of Spain | Haakon VII of Norway | Pope Alexander VII | Murnau | Fokker D.VII | Christian VII of Denmark | Chapter VII of the United Nations Charter | Antipope Clement VII | Louis VII | Constantine VII | Oflag VII-A Murnau | F. W. Murnau | Final Fantasy VII | Murnau am Staffelsee | Henry VII, Holy Roman Emperor | Albert VII, Archduke of Austria | Osman Ali Khan, Asaf Jah VII | MS Stena Superfast VII | Amadeus VII, Count of Savoy | Albert VII | Pope Innocent VII |
He writes that "A man who passed through Rembertów described the conditions. They were not to be compared to the relative luxury at Sandbostel or Murnau".
Following capture he was moved between transit camps until reaching Oflag VII-C, Laufen.
As a result of his efforts, Hamilton-Baillie was moved to Oflag VII-D at Tittmoning, a medieval castle on an isolated plateau in Bavaria, Germany.
As of 2012 the site of the camp is occupied by the barracks and training school of II. Bereitschaftspolizeiabteilung ("2nd Riot Police Division") of the Bavarian State Police.
With other captured officers he was marched across northern France for about 10 days then taken by train from near Luxembourg to Trier, Mainz and onward to Oflag VII-CLaufen in Mid June 1940.