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Nottingham: England fought back brilliantly with the ball after disappointing with the bat on an astonishing opening day of the Ashes series at Trent Bridge.
In a riotous final session, the hosts lost their last four wickets for two runs in crumbling to 215 all out before tearing through Australia's top order with the new ball to reduce them to 75-4.
Peter Siddle was Australia's outstanding performer on an overcast day which offered plenty of assistance to swing bowlers, removing five of England's top seven to finish with figures of 5-50.
But Steven Finn dismissed Shane Watson and Ed Cowan in successive balls and James Anderson took two wickets of his own to leave the match beautifully poised, with Steve Smith on 38 not out.
Australia, huge underdogs in the series, enjoyed the perfect start when fiery fast bowler Peter Siddle took five wickets and England collapsed to 215 all out shortly after tea.
However, Steven Finn removed Shane Watson and Ed Cowan in successive balls and James Anderson dismissed Michael Clarke and Chris Rogers before Australia lurched to the close on 75 for four.
Steve Smith, on 38, and Phil Hughes, seven, were the not out batsmen.
England captain Alastair Cook won the toss and chose to bat in overcast conditions.
James Pattinson's first ball of the series was a wild short-pitched wide and the fast bowler struggled to find his line as the ball swung extravagantly in the air.
Cook and Joe Root had to survive the odd unplayable delivery, but they looked comfortable until the skipper, on 13, drove loosely at a wide ball from Pattinson and nicked a catch through to wicketkeeper Brad Haddin.
The Australians joyously celebrated the wicket of Cook, who scored 766 runs in the last Ashes series, but the situation was tailor-made for the phlegmatic Jonathan Trott.
He greeted Siddle to the attack with successive fours and also dispatched debutant spinner Ashton Agar's first ball in Test cricket to the extra cover boundary.
Root, opening for the first time in Tests, struck six neat fours in a patient 30 but he was deceived by the first ball of Siddle's second spell, a rapid full-length yorker which crashed into his stumps to end a second-wicket partnership of 51.
England took lunch on 98 for two but Kevin Pietersen, returning to the side after injury, nibbled at a Siddle outswinger in the first over of the second session and was caught by Clarke at second slip for 14.
Trott struck eight sweetly-timed fours and was two runs short of his fifty when he carelessly dragged a wide Siddle delivery on to his stumps to leave England in trouble at 124 for four.
Brief scores
England 215 (Trott 48, Bairstow 37, Siddle 5-50, Pattinson 3-69)
Australia 75 for 4 (Smith 38*)
Status Australia trail by 140 runs
