Ryabyshev’s corps had lost almost half its tanks due to mechanical breakdown, including forty-four out of forty-eight T-35 heavy tanks. Ryabyshev’s corps conducted a forward passage of lines early on 26 June, passing through Karpezo’s disorganized corps. Karpezo opted to remain on the defensive, allowing Ryabyshev to make the main effort in assaulting the right flank of General der Panzertruppen Werner Kempf’s XXXXVIII Armeekorps (mot.) between Leshnev and Kozyn. Ryabyshev began a premature attack with General-major Timofei A. Mishanin’s 12th Tank Division at 0900 hours, but the rest of his corps could not be committed until the afternoon. Ryabyshev intended to capture the village of Leshnev, then push on to seize Berestichko, which would isolate the 11.Panzer-Division at Dubno. Ryabyshev was confident that Mishanin’s division, which had a company of KV-1 tanks and a full battalion of T-34 tanks, could accomplish this mission.
Unfortunately, Mishanin’s armour was committed nearly straight off the line of march, with no time to reconnoitre the unfamiliar terrain or for his artillery and engineers to arrive. Consequently, Mishanin conducted a nearly pure-armour attack with his two tank regiments, but only minimal infantry support. The tanks immediately encountered very marshy terrain along the Syten’ka River, which was little more than a stream, but the Soviet tank crews lacked the skill to negotiate even this minor obstacle. Three T-34 tanks were stuck in the marshy terrain and Mishanin was forced to look for an alternate crossing in full sight of the German troops from the 57.Infanterie-Division in Lishnev. As the Soviet tanks bunched up around the river, the Germans called for artillery fire, which pounded the massed armour. Eventually, Mishanin was able to get his tanks across the marshy terrain and assault into Leshnev. The German panzerjäger were overwhelmed by the T-34 and KV-1 tanks and a number of Pak guns were crushed under their tracks. The German infantry abandoned Leshnev and fell back. However, before Mishanin could consolidate on the objective, an armoured kampfgruppe from Hube’s 16.Panzer-Division attempted to retake Leshnev. While the Pz.III and Pz.IV tanks were seriously out-gunned by the T-34 and KV-1 tanks, the German panzers enjoyed artillery and air support, as well as better C2
, which evened the odds considerably. German gunners concentrated on hitting the tracks on the bigger Soviet tanks and succeeded in immobilizing some of the T-34s. Eventually, the German panzers broke off the action and retreated. Mishanin had twenty-five tanks stuck in the marshes or knocked out around Leshnev and was in no position to continue the attack with his unsupported armour. Instead, he sent a company of KV-1 tanks forward to sever the Berestichko-Dublin road and to shoot up some of the German wheeled traffic along this route. Ryabyshev’s other two divisions, the 34th Tank and 7th Mechanized, only got into the fight late in the day and achieved little or nothing.Amazingly, one of the most powerful Soviet armoured units of June 1941 had failed to inflict significant damage on a single German infantry division. The Red Army’s failure to use combined arms tactics – which was mostly due to impatience in the higher command – almost completely negated the superior capabilities of the T-34 and KV tanks. By the end of 26 June, it appeared that Ryabyshev and Karpezo were still in an excellent position to smash in von Kleist’s right flank on the next day, but the Germans had their own surprise in store. German reconnaissance aircraft had been observing the mass of Soviet armour around Brody all day and they had spotted the GAZ-AAA radio trucks belonging to both the 8th and 15th Mechanized Corps command posts. Around 1800 hours, several groups of low-flying Ju-88 bombers from Fliegerkorps V came in and bombed both command posts. Karpezo was badly wounded but Ryabyshev survived, minus his radio truck, which was left burning. This one air strike – which was a result of poor operational security in the Red Army – seriously degraded Soviet C2
in the armoured battles around Dubno. On top of these difficulties, the Stavka reiterated its order at 2100 hours that Kirponos would continue attacking with all armoured forces and forbid even tactical retreats to prevent encirclements.