Title: History of Germany during World War I
Content:  During World War I, the German Empire was one of the Central Powers. It began participation in the conflict after the declaration of war against Serbia by its ally, Austria-Hungary. German forces fought the Allies on both the eastern and western fronts, although German territory itself remained relatively safe from widespread invasion for most of the war, except for a brief period in 1914 when East Prussia was invaded. A tight blockade imposed by the Royal Navy caused severe food shortages in the cities, especially in the winter of 1916–17, known as the Turnip Winter. At the end of the war, Germany's defeat and widespread popular discontent triggered the German Revolution of 1918–1919 which overthrew the monarchy and established the Weimar Republic.
Title: World War II
Content:   On 1 September 1939, Germany invaded Poland after having staged several false flag border incidents as a pretext to initiate the invasion. The first German attack of the war came against the Polish defenses at Westerplatte. The United Kingdom responded with an ultimatum to Germany to cease military operations, and on 3 September, after the ultimatum was ignored, Britain and France declared war on Germany, followed by Australia, New Zealand, South Africa and Canada. The alliance provided no direct military support to Poland, outside of a cautious French probe into the Saarland. The Western Allies also began a naval blockade of Germany, which 
Title: German entry into World War I
Content:  Germany entered into World War I on August 1, 1914, when it declared war on Russia. In accordance with its war plan, it ignored Russia and moved first against France–declaring war on August 3 and sending its main armies through Belgium to capture Paris from the north. The German invasion of Belgium caused Britain to declare war on Germany on August 4. Most of the main parties were now at war. In October 1914, Turkey joined the war on Germany's side, becoming part of the Central Powers. Italy, which was allied with Germany and Austria-Hungary before World War I, was neutral in 1914 before switching to the Allied side in May 1915. Historians have vigorously debated 
Title: Germany
Content:  spheres of influence. On 1 September 1939, Germany invaded Poland, beginning World War II in Europe; Britain and France declared war on Germany on 3 September. In the spring of 1940, Germany conquered Denmark and Norway, the Netherlands, Belgium, Luxembourg, and France, forcing the French government to sign an armistice. The British repelled German air attacks in the Battle of Britain in the same year. In 1941, German troops invaded Yugoslavia, Greece and the Soviet Union. By 1942, Germany and its allies controlled most of continental Europe and North Africa, but following the Soviet victory at the Battle of 
Title: Invasion of Poland
Content:  Following several German-staged incidents, such as the Gleiwitz incident, part of Operation Himmler, which German propaganda used as a pretext to claim that German forces were acting in self-defence, one of the first acts of war took place on 1 September 1939. At 04:45, the old German pre-dreadnought battleship Schleswig-Holstein opened fire on the Polish military transit depot at Westerplatte, in the Free City of Danzig, on the Baltic Sea. However, in many places, German units crossed the Polish border even before that time. Around then, the Luftwaffe attacked a number of military and civilian targets, including Wieluń, the first large-scale 
Title: German occupation of Luxembourg during World War I
Content:  On 1 August 1914, Germany declared war on Russia. On the outbreak of war with its eastern neighbour, Germany put the Schlieffen Plan into action, and Luxembourg's government's fears were realised. Initially, Luxembourg was only a transit point for Albrecht von Württemberg's Fourth Army. One of the railways from the northern Rhineland into France passed through Troisvierges, in the far north of Luxembourg, and Germany's first infringement of Luxembourg's sovereignty and neutrality was the unauthorised use of Troisvierges station. Eyschen protested, but could do nothing to prevent Germany's incursion. The next day, while French troops were still at a distance from the 
Title: Germany–Poland relations
Content:  During World War I, Germany invaded and occupied vast areas of the Russian Partition of Poland, and in August 1914, the German Army carried out the destruction of Kalisz, one of Poland's oldest historical cities. During the war, the Polish Legions led by Józef Piłsudski initially fought on the side of Austria-Hungary and Germany against Russia, in hope of defeating at least one of the partitioning powers and restoring independent Poland at least in the former Russian Partition. Polish military units were also formed in Russia (Polish Armed Forces in the East) and France (Blue Army), enemies of Germany. Per the 
Title: German occupation of north-east France during World War I
Content:  Owing to the speed of the German invasion of Belgium in 1914, fighting reached French soil early in the war. Though their advance was stopped at the First Battle of the Marne in September 1914, the Germans gained control of a portion of French territory which remained under German occupation behind the stabilized Western Front for much of the rest of the war.
Title: World War II by country
Content:   Nazi Germany, led by Adolf Hitler, was the primary Axis Power in the European Theatre. German forces instigated the war in September 1939 by invading Poland. Poland was divided with the Soviet Union. The Phony War ensued and in the spring of 1940 German forces invaded and conquered Denmark, Norway, France, Belgium, Luxembourg, and the Netherlands. Attempts to subdue the United Kingdom by air in the summer of 1940 failed and a planned invasion was called off. In the summer of 1941 Germany turned its forces east by invading the Soviet Union. The Eastern Front became the main theatre of war for the Germans. The invasion of the USSR had been delayed by campaigns in Greece 
Title: Atlantic Theater aircraft carrier operations during World War II
Content:  During the 1930s, Germany began rebuilding her military from its dissolution following World War I. She initially achieved annexations short of war by unopposed initiatives in Alsace-Lorraine, Austria, and Czechoslovakia. Emboldened by weak responses from the Allies, Germany launched the war in Europe with a ‘’Blitzkrieg’’ invasion of Poland. This was followed by successful German invasions of Denmark, Norway, the Netherlands, Belgium, and France. Italy joined what she perceived would be a short war in order for her to benefit from the spoils. Although Britain was not invaded or subjugated by Germany's intensive bombing campaign, Britain's survival was threatened by an Axis blockade using submarines, warship raiders, and land-based aircraft that undermined 

Question: what country did germany invade first in ww1?
Answer: Belgium.