The Battle of Baška Grapa (in Italian: Battaglia del torrente Baccia; in Slovenian: Bitka pri Baški grapa) was a pitched battle fought on the right bank of the Isonzo, in present-day Slovenia, between 29 June and 3 July 1944 between the Army of the Italian Social Republic, supported by the Wehrmacht, and Slovene Partisans, during the World War II.

During 1943, following the Allied invasion of Italy, as a consequence of the strengthening of Tito 's partisans, tensions at the gates of Friuli grew more and more.

In the Battle of Baška Grapa, during the autumn of 1943, the Bersaglieri of the 1st "Mussolini" Battalion, belonging to the 8th Bersaglieri Regiment, were sent and distributed in various strongholds placed to defend the territory. From the very beginning, the young Bersaglieri had to face repeated attacks launched by the IX Korpus of the People's Liberation Army of Yugoslavia.

In the summer of 1944, the IX Korpus set itself the objective of expanding its movement zone, which was hindered by the presence of the railway line, which passed right through the middle of the partisan deployment, the latter being thus divided in two for a stretch of 20 km. A hypothetical annihilation of the Mussolini battalion would have led to the complete occupation of the Baška Grapa by the Slovene Partisans, followed by a heavy moral blow to the Italians.

The stretch of road and railway from Gorizia to Podbrdo were controlled by 1,500 men, acoording to the Slovenians.

A few hundred Italian Alpine troops covered the Most na Soči–Bovec–Tolmin pass. The great attack of the IX Slovenian Korpus took place at the end of June 1944 and developed from railway toll booth 92, around the Bača river, up to railway toll booth 107 near the Podbrdo tunnel.

The defensive deployment included 1,100 men of which 800 from the 1st "Mussolini" Bersaglieri Battalion and 200 from the Alpini Battalion "Val Tagliamento".

About 450 men were those who supported the great attack for 4 days.

According to Petelin [sl], the defenders were around 500. While other sources claim that the attack was supported by 700 men.

The attack took the defenders completely by surprise, who had never imagined an attack of such magnitude, the soldiers of the IX Korpus were masters in concealing their vehicles and logistics, to transport in total silence an attack force of between 5,000 and 7,000 men. The Slovene Partisans included the "Kosovel", "Triestina", "Bazoviška", "Gradnik", "Vojko" and "Preseran" brigades.

At 2 o'clock on 29 June the attack began. While the main parts of the "Kosovel" Brigade, supported by artillery, attacked Kneža, the 1st and 3rd Battalions were instead charged with conquering Clavice. The "Triestina" Brigade attacked the toll booths 93 and 96 of the railway. In this sector the partisans concentrated their efforts using approximately 1,500 men, supported by 2 pieces of artillery, 4 47 mm cannons, 4 81 mm mortars, 12 light mortars. The assault on the Clavice station by the "Kosovel" brigade was unsuccessful, because the partisans were not familiar with the defences and encountered tangles of barbed wire on their way several times and, because of this, by dawn the Slovene Partisans had already suffered 10 casualties.

Meanwhile, in Podmelec the situation was unstable: 5 bersaglieri had been knocked out by a targeted artillery strike while another squad was surprised by the partisans and lost two men. On the other hand, 4 fallen partisans were found.

In Kneža the partisan artillery hit the whole surrounding area although with poor precision, in this sector the defenders suffered one casualty and 10 wounded while the attackers suffered heavy losses due above all to the 81mm mortar and the anti-aircraft gun defending the area, which hit the side of the Koncarje ridge.

From Most na Soči a truck was sent out with 1 officer and 7 riflemen, but when it reached Podmelec it was hit by partisan fire, the riflemen were almost all wounded and managed to find shelter in a house where they tried to resist, but once the partisans surrounded the house, the riflemen had no other solution than to surrender. The same people were made prisoners and were shot in Ponivke the same day. The partisans of the "Bazoviška" brigade and members of the 9th Korpus' artillery took part in the clash; due to the lack of further information it only appears that the partisans suffered one wounded during these battles.