Division Two table-toppers Lancashire took complete control on day two of their LV= County Championship clash with lowly Leicestershire at Grace Road.
After totalling 380 in their first innings, Lancashire followed up with some excellent bowling to leave the home side reeling on 127-7 at the close of play, still needing 104 runs to avoid the follow on.
At one stage the hosts were 46-4 but a stand of 65 between Niall O'Brien and Shiv Thakor temporarily halted Lancashire's progress, as did a thunderstorm that hit just before tea and lopped 13 overs off the day's play.
However, on the restart O'Brien was bowled by Glen Chapple for 41 and two more wickets in the final three overs put Lancashire in total control.
Thakor, having batted with great determination to score 34 off 130 balls, edged to slip off Simon Kerrigan and Tom Wells (9) was trapped lbw by Kyle Hogg.
It was Hogg who had made the first breakthrough just before lunch, finding the edge to have Greg Smith (4) caught at slip, while Michael Thornely (8) was also taken in the slip cordon off the bowling of Tom Smith.
Chapple then knocked back Ned Eckersley's off stump for 25 and Kerrigan had Matt Boyce (5) caught at short leg as Leicestershire's top order collapsed.
Lancashire began the day on 303-5 and, in an entertaining morning session, added a further 77 runs in 21 overs for the last five wickets as Luke Procter (67) and Gareth Cross (33) went on the attack.
The seventh-wicket stand was broken when Procter top edged a catch trying to sweep James Sykes and from there Lancashire's innings imploded as seamer Ollie Freckingham took the last three wickets for five runs in to finish with figures of 4-85.