to complete the first wave. The majority of the troops were stationed along the Franco-Belgian border but British divisions took turns to serve with the French Third Army on the Maginot Line. In April 1940, the 51st Highland Infantry Division, reinforced by additional units and called Saar Force took over part of the French line. Belgium and the Netherlands were neutral and free of Allied or German military forces and for troops along the Maginot Line, inactivity and an undue reliance on the fortifications, which were believed to be impenetrable, led to "Tommy Rot" (portrayed in the song "Imagine Me in the Maginot Line"). Morale was high amongst the British troops but the limited extent of German actions by 9 May 1940, led many to assume that there would not be much chance of a big German attack in that area. From January to April 1940, eight Territorial divisions arrived in France but the 12th (Eastern) Infantry Division, 23rd (Northumbrian) Division and 46th Infantry Division, informally called labour divisions, were not trained or equipped to fight. The labour divisions consisted of 26 new infantry battalions which had spent their first months guarding vulnerable points in England but had received very little training. Battalions and some engineers were formed into nominal brigades but lacked artillery, signals or transport. The divisions were used for labour from St Nazaire in Normandy to Saint-Pol-sur-Ternoise (St Pol) in French Flanders, on the understanding that they would not be called upon to fight before they had completed their training. By May 1940 the BEF order of battle consisted of ten infantry divisions ready for field service, in I Corps, II Corps, III Corps and Saar Force. BEF GHQ commanded the Field Force and the BEF Air Component Royal Air Force (RAF) of about 500 aircraft but the Advanced Air Striking Force (AASF) long-range bomber force was under the control of RAF Bomber Command. GHQ consisted of men from Headquarters (HQ) Troops (consisting of the 1st Battalion, Welsh Guards, the 9th Battalion, West Yorkshire Regiment and the 14th Battalion, Royal Fusiliers), the 1st Army Tank Brigade, 1st Light Armoured Reconnaissance Brigade, HQ Royal Artillery and the 5th Infantry Division. Phoney War The period from September 1939 to 10 May 1940 was known as the "Phoney War", which consisted of little more than minor clashes by reconnaissance patrols. The section of the Franco-Belgian border to be held by