This largest and bloodiest battle of the Balkan Wars the Bulgarians again emerged victorious and the Ottoman forces retreated in complete disorder.

By the time the Bulgarians continued the advance the Ottoman Army had occupied the Chataldzha defensive line where it finally managed to hold its opponent after the battle on 4 and 5 November 1912.

In the aftermath of the First Balkan War the tensions between the allies grew significantly, as Bulgaria felt cheated out of its rightful share by Serbia and Greece.

The First Army, still under the command of Lieutenant General Vasil Kutinchev, was deployed in the northwestern part of the country between Vidin and Berkovitsa, along the old border with Serbia.

That move had a very negative effect on the morale of the troops and even caused opened mutinies in the Ninth Division which became completely disorganized during the retreat.

Even though by now most of northwestern Bulgaria was lost, General Kutinchev kept a few battalions in the fortress of Vidin which managed to hold off all Serbian attacks until the end of the war.

A general armistice was concluded on 18 July 1913 and ten days later the Treaty of Bucharest, which stipulated immediate demobilization of the Bulgarian Army, was signed.

Bulgaria's main aim was to regain Macedonia but Serbia was unwilling to make any compromises which gave the German diplomacy a great advantage.

Once Bulgaria declared mobilization the Serbian High Command planned a preemptive strike against the Bulgarian forces who were still concentrating and organizing on the border.

However, the Serb Prime Minister Pašić did not dare to attack Bulgaria over explicit opposition of all the Allied Powers (Russia, France and Great Britain).

In the southern sector the "Sofia" infantry division was engaged in heavy fighting with parts of the Serbian Second Army and failed to take Pirot.

However, the Bulgarian advance in the north was proceeding more rapidly and the taking of Knjaževac by the "Tundzha" division eventually forced the Serbians to pull out of Pirot in order to avoid encirclement.

Faced with the war on several fronts the Serbian High Command decided that it is best for the army to try to hold its opponents for as long as possible and retreat slowly to the south, southwest until help arrived from the Allies who had landed in Thessaloniki.

However, after the fall of Niš the Germans began pulling out some of their forces from the Balkans and the Bulgarian Sixth and Ninth divisions had been slowed by the swollen waters of the Morava and the destruction of its bridges.

Contrary to the intentions of generalfeldmarschall Mackensen the advance of his army group proved to be difficult and slow due to bad roads, lack of supplies and the cold weather.

The exhausted Serbians failed to achieve their aims and in the face of the continued advance of the Bulgarian forces towards Pristina from the east and the south ordered a general withdrawal .

The Germans thought that the campaign was over and continued pulling out their troops from the front while the pursuit of the retreating opponent was left mostly to Bulgarian and Austro-Hungarian forces.

With the successful conclusion of the Serbian campaign and withdrawal of the French and British expeditionary forces back to Salonika the Bulgarian armies reached the Greek border.

The Bulgarian commander-in-chief general Nikola Zhekov remained concerned about the increasing Allied presence in Greece and insisted upon an attack on Salonika.

Instead on 9 February 1916 during a meeting in the German military headquarters in Pleß he and the Chief of the General Staff von Falkenhayn agreed to begin fortifying the positions that were already taken on the Greek border and to resolve the question of an offensive latter.

By 1 June the Entente forces were additionally strengthened by the arrival of some 115,488 Serbian soldiers, which were organized in three corps-sized formations called armies.

By July Romania was preparing to enter the war on the side of the Entente which placed Bulgaria in a difficult position facing a possible war on two fronts and in the beginning of August the French and British launched an offensive against the Bulgarian positions at Lake Dojran which convinced the Bulgarian high command that the Allies were preparing a general offensive.

To counter these negative developments the Bulgarians planned an offensive of their own with both their flanks aiming to shorten the front line and influence Romania in its decision to enter the war.

General Boyadzhiev agreed to attack but had concerns regarding the final results of the offensive because his army was scattered on a 140 km front and lacked enough mountain and heavy artillery.

The Serbians were constantly reinforced with new artillery and fresh troops thanks to railway that reached the battlefield while the Bulgarians soon began depleting their ammunition stocks.

The former units of the First Army, now under German command, continued fighting around Monastir till December when the Allied offensive was finally halted.

This offensive, however, proved a big disappointment as the French who took the Yarebichina peak from the Fifth "Danube" Division were driven back by the Bulgarians and the British suffered a heavy defeat in the Second Battle of Dojran.

On the next day at Lake Doiran the Allies began a two-day artillery barrage in which more than 300,000 ordinary and gas shells were fired on the Bulgarian positions.

The Kingdom of Bulgaria, under Tsar Boris III, aligned itself with Adolf Hitler's Nazi Germany, and as a result regained Southern Dobruja in the Treaty of Craiova of September 1940, and occupied Western Thrace, and much of Macedonia after the Germans invaded Yugoslavia and Greece in April 1941.

The First Army, along with the rest of the Bulgarian forces, advanced into Hungary and Austria in the spring of 1945, despite heavy casualties and bad conditions in the winter.