Question: What battle was later made into a silent film, about the Second World War?

Context paragraphs:
Mary Ryan (actress; 1885-1948): Mary Ryan (November 11, 1885 – October 2, 1948) was an American stage and screen actress.  She began acting as a child and was a popular young ingenue in the first decade of the twentieth century.  She later made over 30 silent film shorts.  She appeared in the 1906 hit play "Brewster's Millions" starring Edward Abeles.  She was the leading lady to young John Barrymore in his first breakout Broadway success, "The Fortune Hunter" (1909).  In 1912 she signed with the Philadelphia based Lubin Manufacturing Company to appear in their short films.  She is not to be confused with actress Mary Nash who was also born as "Mary Ryan".

David Dunbar (actor): David Dunbar (14 September 1886 – 7 November 1953) was an Australian film actor.  Dunbar was a prominent actor in American and British silent films, particularly in westerns, but switched to playing more minor roles after the arrival of sound.  In later years he appeared mostly in British-themed Hollywood films.  He was one of the first film actors beginning his screen career with Pathe Freres, Paris in 1910.  Previously he was an actor on the legitimate stage both in Australia, his homeland and in Britain.  On 7 March 1926 his wife Blanche was killed in a car collision in the Hollywood Hills.  He had one sister, Miriam Kathleen (Strachan) Dunbar who remained in Petersham, New South Wales.  Miriam married William Thomas Strachan, the children of that marriage being Miriam Kathleen and William James Strachan.  William James (Bill) returned from the Second World War to Australia and settled with his wife Barbara (Grant) Strachan in Sydney and later in Melbourne, Victoria, bringing up three children, Susan Marion, William Grant and Scott James Strachan.  The Strachan family included Graeme Ronald (Shirley) Strachan, a media personality and lead singer of the 1970s rock group "Skyhooks".  Miriam Kathleen married Ronald George Fordham, who perished as a prisoner of war in Malaya during the Second World War.  Miriam Kathleen died in 1944, leaving Brian Ronald and Joan Fordham.

Battle of Dunkirk: The Battle of Dunkirk was a military operation that took place in Dunkirk (Dunkerque), France, during the Second World War.  The battle was fought between the Allies and Nazi Germany.  As part of the Battle of France on the Western Front, the Battle of Dunkirk was the defence and evacuation of British and Allied forces in Europe from 26 May to 4 June 1940.

Margaret Illington: Margaret Illington "ill-ing-ton" (July 23, 1879 – March 11, 1934) was an American stage actress popular in the first decade of the 20th century.  She later made an attempt at silent film acting by making two films with Adolph Zukor's Famous Players-Lasky franchise.  After her film and theater career were over she settled down as the wife of Major Edward Bowes, her second husband whom she married in 1910.  There were no children with either husband.

Keith Park: Air Chief Marshal Sir Keith Rodney Park, (15 June 1892 – 6 February 1975) was a New Zealand soldier, First World War flying ace and Second World War Royal Air Force commander.  He was in operational command during two of the most significant air battles in the European theatre in the Second World War, helping to win the Battle of Britain and the Battle of Malta.  In Germany, he was supposedly known as "the Defender of London".

USS Buck (DD-420): The second USS "Buck" (DD-420), a World War II-era "Sims"-class destroyer in the service of the United States Navy, was named after Quartermaster James Buck, a Civil War Medal of Honor recipient.  It was built by Philadelphia Naval Shipyard and launched in 1939.  It was a member of the convoy carrying the US 1st Provisional Marine Brigade.  She served during the Second World War.  It was sunk by the German submarine "U-616" on 9 October 1943 off the coast of Salerno, when it was working in support of Operation Avalanche.  It received 3 battle stars for its services during the Second World War.

Jim Wallwork: Staff Sergeant James Harley Wallwork DFM (21 October 1919 – 24 January 2013) was a British soldier and a member of the Glider Pilot Regiment who achieved notability as the pilot of the first Horsa glider to land at Pegasus Bridge in the early hours of D-Day, 6 June 1944, during the Second World War.  This achievement was described as "the greatest feat of flying of the second world war" by Air Chief Marshal Sir Trafford Leigh-Mallory.  Although most noted for his part in the Battle of Normandy, Wallwork flew gliders in every major British airborne operation of the Second World War.  These also included the Sicily landings, Arnhem and the Rhine Crossings.  In later life he lived in Vancouver.

Battle and theatre honours of the Australian Army: The Australian Army and its forerunners have won many battle and theatre honours since its formation.  The first honour given to an Australian unit came prior to Federation and was awarded to forces from the colony of New South Wales, which contributed a small contingent consisting of an infantry battalion, with artillery and support units to take part in the short-lived British campaign against the Dervish revolt in the eastern Sudan in 1885 following the death of General Charles Gordon at Khartoum.  The next conflict that saw Australian units receive battle or theatre honours was the Second Boer War.  Between 1899 and 1901, forces from the six Australian colonies fought alongside each other before being replaced in 1901 by forces of the newly established Australian Army following Federation.  A total of five theatre honours were awarded for service in South Africa, being bestowed upon successor units in the form of honorary banners and distinctions presented in 1904, 1908 and 1911.  Since then, the Australian Army has received honours for fighting during the First World War, the Second World War, the Korean War and the Vietnam War, with the Royal Australian Regiment last being awarded a battle honour in 1994 for the First Battle of Maryang San in Korea.  In 2013 units of Special Operations Command were awarded the battle honour Eastern Shah Wali Kot for their actions in Afghanistan in May and June 2010.  A total of 246 honours have been awarded.

Paul Capellani: Paul Capellani (September 9, 1877 – November 7, 1960) was a noted French silent film actor.  His brother was the director Albert Capellani and his uncle the film director Roger Capellani who died May 1940 at the Battle of Dunkirk.

Battle of Calabria: The Battle of Calabria, (known to the Italian Navy as the Battle of Punta Stilo) was a naval battle during the Battle of the Mediterranean in the Second World War.  It was fought between the Italian Royal Navy ("Regia Marina") and the British Royal Navy and the Royal Australian Navy.  The battle occurred 30 miles to the east of Punta Stilo, Calabria, on 9 July 1940.  It was one of the few pitched battles of the Mediterranean campaign during the Second World War involving large numbers of ships on both sides.  Both sides claimed victory, but in fact the battle was a draw and everyone returned to their bases as soon as possible.

Supporting paragraphs: Paul Capellani Battle of Dunkirk
Answer: Battle of Dunkirk