A Siege and an Offensive
For months little progress was made in the south. Just like the Great War massive trench lines ran across the line and there were massive attacks that killed thousands with only a few inches gained. By July victories in the north convinced many in the Republican government (particularly Negrin and Ibarruri) that there was less of a threat to Madrid there and that the best way to relieve Madrid would be to make gains in the south. To that end the rest of July and the early part of August were spent organizing an offensive from Jaen to Cordoba, where there were less Nationalists than around Granada/Malaga. General Juan Modesto was given command of the Republicans in Jaen.
The first shots were fired on August 8th. One part of the army pushed towards Castro del Rio while the other pushed Porcuna. To reach Porcuna the Republicans had to go through the a large group of hills that were covered in trenches and bunkers. The first wave of assaults was a massive failure. As the Republicans charged machine guns and artillery tore their ranks apart and hastily buried mines blew off limbs. After 4 days of horror the first Republicans managed to reach the trench lines. Armed with submachine guns and grenades the first Republican troops carved a bloody path through the trenches while others launched brutal attacks on pillboxes and bunkers. After two days the Republicans seized the hills, but the fortifications on them were destroyed.
The assault on Castro del Rio had also been a success and the Republicans moved towards Cordoba. By August 18th they had reached the outskirts of the city. But on August 19th bombers struck Castro del Rio. The Nationalists had gathered men southeast of Castro del Rio in Lucena as the Republicans had launched their attacks. The troops left by the Republicans to guard Castro del Rio and Fernan-Nunez were unable to withstand the assault and were forced to withdraw. For the next 8 days the Nationalists pushed towards Cordoba, crushing the Republican opposition. Finally the Republicans launched a counterattack. On the night of August 26th Republican artillery began to hit positions near the hamlet of Santa Cruz. Troops surged forward, followed by tanks. In the darkness men fired at any shadow and soon the only thing that could be heard was the sound of gunfire. After several hours the Republicans were able to push the Nationalists back. Although it would take 10 days the Republicans were able to retake Castro del Rio, but the manpower losses meant that the offensive was over.
In the north Pamplona was in dire straits. Despite the strong positions on the hills by August 5th the Nationalists were seriously outnumbered and facing dwindling supplies of artillery shells and food. The Republicans also had almost complete control of the air. On August 6th the Republicans decided to attack the hill near Campanas (later named Montanita Verde). This was the tallest hill and the most strategic since whoever controlled it would be able to fire on Pamplona as well as make it difficult to hold positions to the southeast and southwest of the city. Knowing this the Nationalists had dug in and put much of their artillery on Montanita Verde.
The Republican advance up the hill was incredibly difficult. Nationalist artillery and machine guns tore the advancing troops to ribbons; with the hail of bullets so thick that they even cut down trees. From the air the Republicans dropped tons of bombs. This slow advance continued until the Republicans reached the top of Montanita Verde on the 10th. Veteran troops were sent to capture the most bombed out parts of the trench. They charged from tree to tree, up the hill, under heavy fire. Many of the men were cut down in the hail of bullets but many reached the trench. After the weaker areas of the trench were seized regular troops attacked the now cut off parts of the trenches. The Nationalists had prepared and the top of the hill was covered with trenches, foxholes, and improvised pillboxes; which the Nationalists realized they had to hold at all costs. Manuel Fal Conde (who had flown to Pamplona when the Navarre Offensive began) met many of the troops that were heading up the hill and told them to “die so that Spain could live.” The Nationalists fought with an unmatched ferocity. There were stories of Nationalist soldiers who continued to fight despite having been shot multiple times or had their bodies destroyed by grenades. These men were nicknamed Los Salvajes (Savages). In the end it wasn't enough and by August 14th the Republicans controlled the hill. General Infantes pulled his troops into Pamplona but realized that from the hill and from the air the Republicans could simply destroy the city. Infantes, Fal Conde, and the troops fled north to go guerrilla.
Even before the fall of Pamplona the Germans were cutting off their aid. After Pamplona Hitler decided that Spain was lost and could only be a “graveyard for German troops.” Hitler decided to withdraw all German troops, including the Condor Legion. The loss of the German troops and many Nationalist troops (including most of the Requetes) severely damaged the Nationalist armies. Although Franco had been skeptical of foreign volunteers Mola decided that they might be the only hope the Nationalists had. Mola had the same reasoning that the Republicans had with the International Brigades as well as the example set by the nearly 8,000 Portuguese volunteers. Agents were sent to several countries to negotiate with local Fascist leaders. These Foreign Brigades (as they were dubbed) are believed by some historians to have been great help to the Nationalist cause.