Alex Watson - Ring of Steel
"German leaders entered the conflict with no firm goals, but their army's rapid advance through Belgium and into Northern France soon focused minds on the fruits of victory. Already on 9 September 1914, Chancellor Bethmann Hollweg approved the first highly secret but still provisional war aims programme. Written by his principal assistant, Kurt Riezler, this document stated boldly that 'the general aim of the war' was 'security for the German Reich in west and east for all imaginable time'. This disarmingly simple aim was to be the basis of German policy throughout hostilities. While it was defensive in conception, the intention to achieve everlasting security as a zero-sum game to be won through domination not cooperation., it soon slid into aggression. To secure Germany 'for all imaginable time' could not, even in Bethmann's mind and certainly not for the more hawkish elites around him, mean merely a return to the unstable status quo of the last peacetime years. Instead it required permanent control of invasion routes and the subjection of dangerous neighbours: 'France must be so weakened as to make her revival as a great power impossible for all time. Russia must be thrust as far as possible from Germany's eastern frontier and her domination over the non-Russian vassal peoples broken.'
"The September memorandum was a list of maximum demands to be imposed if the German army succeeded decisively in beating the French in the west. Two broad themes ran through it. First was security. France was to be eternally exposed to the threat of invasion through possible border adjustments in the Vosges, the seizure of the Belfort fortress in that region, and the razing of other frontier defences. Her military potential would be eliminated by a war indemnity 'high enough to prevent [her] spending any considerable sums on armaments in the next 15-20 years'. Belgium was to be 'reduced to a vassal state' and like France made vulnerable by the confiscation of the fortress and city of Liege that the German army had found so difficult to defeat one month earlier. The memorandum was intent on establishing, along with the enduring security of the Reich's western border, a base for continuing war against its most formidable enemy, Britain. The maritime power's perfidious influence on the continent would be negated through the occupation of Belgium's naval ports. The taking of the French coast from Dunkirk to Boulogne, possibly joined to the new submissive Belgian state, would enable the Kaiser to station his navy opposite Dover, permanently threatening the United Kingdom's southern coast.
"The second preoccupation in the September memorandum was economic. It emphasized and furthered German peacetime imperial goals in seeking 'a continuous Central African colonial empire'. However, the document mostly broke with the past in focusing less on overseas possessions than on formal and informal economic expansion in Europe. The Germans planned to grab some valuable economic assets from their enemies. The Longwy-Briey mines, which yielded 81 per cent of French iron ore and were already in German hands, were to be permanently annexed. Avariciously, the Chancellor's memorandum also envisaged taking the premier commercial entrepot of Antwerp. A German-owned corridor would run from the city south-east to Liege, which would become German Luttich. However, the keystone of the new economic order envisaged in the September programme was a more subtle 'central European economic association through common customs treaties to include France, Belgium, Holland, Denmark, Austria-Hungary, Poland, and perhaps Italy, Sweden and Norway'. Here lay the beginnings of Bethmann Hollweg's infamous Mitteleuropa project."
Not claiming that this is why Germany entered the war (I certainly don't believe it to be the case) but I leave it to you to decide if this could be described as "serious ambitions for territorial expansion on the part of either A-H or Germany in 1914".