It’s nothing like the great breakthroughs of the mid-20th century wars, when combined air and ground forces would tear a hole in the enemy line, the tanks would pour through, and the front would roll back several hundred kilometres before it stabilised again.
The breakthrough in Ukraine is happening now, but in slow motion. Even on the fastest-moving front, in western Zaporizhzhia, it has taken the Ukrainian infantry 10 weeks to advance 10km through the dense and heavily defended Russian minefields — not much faster than the British army at the Battle of the Somme in 1916.
But the Ukrainians have finally broken through the main Russian line just to the west of the fortified village of Verbove, and expanded the breech wide enough to start moving heavy equipment through it.
There are further, less well built Russian entrenchments behind this line, and even more trenches are being dug farther south right now, so don’t imagine Ukrainian tank columns racing across the landscape. Unless the Russian army collapses, it’s never going to be like that again.
But the Ukrainians will now be able to advance faster — a few kilometres a week, perhaps — until the rasputitsa (the rain and mud season) arrives some time next month and stops all off-road movement for vehicles until the winter freeze-up.