As political tensions escalated in the years leading to World War II, the Belgian government again announced its intention to remain neutral in the event of war in Europe. The military was reorganised into a defensive force and construction began of defences in the east of the country. When France and Britain declared war on Germany in September 1939, Belgium remained strictly neutral while mobilising its reserves. Without warning, the Germans invaded Belgium on 10 May 1940. During the following 18 Days' Campaign, the Belgian army was pushed back into a pocket in the north-west of Belgium and surrendered on 28 May. The government fled to France, and later the United Kingdom, establishing an official government and forming a small military force made up of Belgian and colonial troops, known as the Free Belgian Forces and which fought as part the Allied forces. For infantry, our WWII French in Adrian helmets can be used.