The Belgo-Congolese situation remained difficult until early June, when the Baro and Sobat rivers rose enough for reinforcements from the Congo to reach them.
They then decided to try to sever the Italian supply line between Saïo and Mogi, another town upon the plateau.
To hold the line near Bortai Brook, the Belgians could only spare around 250 men for an attack.
It was hoped that cutting the Italians off would allow the British, stalled in their advance at Gidami, to move south and encircle Saïo.
On 9 June the Belgian force attacked Mogi, their flank covered by the arrival of a new battalion from the Congo.
The Italian garrison, numbering around 300 men, held off the assault.
Believing that the town could only be taken at a heavy cost, the Belgians instead fortified their positions around Mogi and sent patrols to ambush the road by which Saïo was being supplied.

At the regular front, Lieutenant Colonel Dronkers-Martens ordered his troops to increase their patrol activities upon the Saïo Plateau, to make the Italians believe that they were facing superior forces.
They used shoot-and-scoot tactics, avoiding counter-battery fire and leaving the Italians with the impression that they were facing multiple consistent points of fire.
Gazzera tripled the size of the Mogi garrison and the Italians began to reduce their activity as the Belgians became bolder.
Eventually the South African Air Force (SAAF) committed three Hawker Hart biplanes to regularly bomb the Saïo fortress and strafe the surrounding roads.
In the east, British forces pressed on, forcing Gazzera to abandon his own headquarters in Jimma in mid June and withdraw to Saïo.
The 2/6th KAR secured Gidami and headed southeast to cut the Saïo–Yubdo road.
By the end of the month, the British had driven the Italians from the western bank of the Didessa River.
The Italian 23rd and 26th Colonial divisions were ordered to retreat through Yubdo, to make their final stand at Saïo.
Heavy rain, actions of the Arbegnoch and the raids from the SAAF added to their problems.
The Belgo-Congolese situation remained difficult until early June, when the Baro and Sobat rivers rose enough for reinforcements from the Congo to reach them. They then decided to try to sever the Italian supply line between Saïo and Mogi, another town upon the plateau. To hold the line near Bortai Brook, the Belgians could only spare around 250 men for an attack. It was hoped that cutting the Italians off would allow the British, stalled in their advance at Gidami, to move south and encircle Saïo. On 9 June the Belgian force attacked Mogi, their flank covered by the arrival of a new battalion from the Congo. The Italian garrison, numbering around 300 men, held off the assault. Believing that the town could only be taken at a heavy cost, the Belgians instead fortified their positions around Mogi and sent patrols to ambush the road by which Saïo was being supplied.
At the regular front, Lieutenant Colonel Dronkers-Martens ordered his troops to increase their patrol activities upon the Saïo Plateau, to make the Italians believe that they were facing superior forces. They used shoot-and-scoot tactics, avoiding counter-battery fire and leaving the Italians with the impression that they were facing multiple consistent points of fire. Gazzera tripled the size of the Mogi garrison and the Italians began to reduce their activity as the Belgians became bolder. Eventually the South African Air Force (SAAF) committed three Hawker Hart biplanes to regularly bomb the Saïo fortress and strafe the surrounding roads. In the east, British forces pressed on, forcing Gazzera to abandon his own headquarters in Jimma in mid June and withdraw to Saïo. The 2/6th KAR secured Gidami and headed southeast to cut the Saïo–Yubdo road. By the end of the month, the British had driven the Italians from the western bank of the Didessa River. The Italian 23rd and 26th Colonial divisions were ordered to retreat through Yubdo, to make their final stand at Saïo. Heavy rain, actions of the Arbegnoch and the raids from the SAAF added to their problems.
Siege of Saïo