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| 0838 | Louis I the Pious |  |
| Civil war breaks out in the Empire |
| 1198 | Otto IV | |
| Swabia Otto is supported by the Guelfs against Philip, Duke of Swabia, as Emperor |
| 1238 | Frederick II | |
| Frederick II's 3rd Lombard Campaign |
| 1239 | Frederick II | |
| Gregory IX declares a Crusade against Frederick II |
| 1266 | Conradin | |
| On the death of Manfred begins war with Charles of Anjou |
| 1494 | Maximilian I | |
| Fights a war with France over the sovereignty of Milan & Naples |
| 1636 | John George I | |
| Saxony Declares war on Sweden |
| 1713 | Frederick William I | |
| Goes to war with Sweden over Pomerania |
| 1756 | Frederick II the Great | |
| 28th Aug Saxony Begins the Seven Years War by launching a pre-emptive invasion of Saxony |
| 29th Aug Saxony Frederick strikes 1st by crossing the Saxon border with 70,000 men |
| 1792 | Frederick II | |
| 13th June Berlin Prussia declares war on France against the anti-monarchism of the Legislative Assembly |
| 1806 | Frederick William III | |
| Resumption of war against Napoleon |
| 1870 | Abeken, Heinrich | |
| 13th July Bismarck uses Abeken's telegram to declare war |
| 13th July Ordered by William to telegram Bismarck of the telegram received from Gramont |
| 1870 | Bismarck-Schonhausen, Otto Furst von | |
| 13th July Bismarck uses Abeken's telegram as provocation of war |
| 19th July Germany is supported by England & Russia who see Napoleon III emulating Napoleon I |
| 19th July War is declared against France |
| 1913 | Ebert, Friedrich | |
| Persuades the SDP to vote for war credits to defend Germany from the Tsarist autocracy |
| 1914 | Bethmann Hollweg, Theobald von | |
| 1st Aug Germany declares war on Russia |
| 3rd Aug Germany declares war on France |
| 4th Aug Germany declares war on Belgium |
| 12th Aug Montenegro declares war on Germany |
| 12th Aug Serbia declares war on Germany |
| 23rd Aug Japan declares war on Germany |
| 1914 | Schoen | |
| 3rd Aug Declared because France had dropped bombs on Belgium & Germany as far as Nurnberg |
| 3rd Aug Declares war on France on behalf of the German Government |
| 1914 | Stressman, Gustav | |
| Supports the war effort & annexationist war aims |
| 1914 | Wilhelm II | |
| 1st Aug Berlin Declares war on his cousin Tsar Nicholas II of Russia |
| 1916 | Ebert, Friedrich | |
| Berlin Supports defending German territory, including Alsace & Lorraine, non-annexationist |
| Berlin The Party is split by Ebert's opposition to the minority anti-war caucus of the SDP |
| 1937 | Hitler, Adolf | |
| 5th Nov Declares to the service chiefs Germany must use force to win teritory in 1938 or 1939 |
| 1939 | Hitler, Adolf | |
| 3rd Sep Poland's western allies, the United Kingdom, Australia and NewZealand declare war on Germany, soon followed by France, SouthAfrica and Canada |
| 1941 | Hitler, Adolf | |
| 21st June Germany declares war on Russia shortly after the invasion |
| 8th Dec Berlin Announces to a Greater German Reichstag he had declared war on the US |
| 1941 | Ribbentrop, Joachim von | |
| 22nd June Berlin Declares war on Russia |
| 1941 | Schulenburg | |
| 22nd June Berlin Schulenberg delivers Germany's declaration of war to Molotov |
| 1942 | Hitler, Adolf | |
| 5th June USA declares war on Bulgaria, Hungary and Romania |
| 1943 | Hitler, Adolf | |
| 13th Oct Italy declares war on Germany |
| 4th Dec Bolivia declares war on the Axis powers |
| 1944 | Hitler, Adolf | |
| 26th Aug Bucharest Roumania declares war on Germany after German troops are defeated in Bucharest |
