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In 1st Chechen war Russia started an infamous siege of Grozny in 1993 by simply sending a column of tanks to the town. I don't know what they were thinking (legend is that it was Grachov's birthday) but because they didn't send any infantry cover, Chechens just decimated them with RPG firing from above.
After this failure Russia changed tactic: each offensive on a town started with heavy artillery shelling & air bombing. Then tanks & infantry, killing who was left.