Andy Webster scored on his debut as a lacklustre Rangers overcame a Champions League hangover to sweep aside Gretna.
The SPL newcomers gave the leaders some nervous moments before Kris Boyd's 20-yard free-kick deflected past keeper Greg Fleming after 37 minutes.
Webster, plagued by injury since signing from Wigan last season, headed in off the crossbar after 63 minutes.
Carlos Cuellar headed the third and Gretna's Aurelien Collin deflected in Jean-Claude Darcheville's cross.
Rangers' deadline-beating signing, Steven Naismith, had started on the bench before making his debut with seven minutes remaining.
Webster, Boyd and Daniel Cousin came in for David Weir, Brahim Hemdani and Darcheville following the Champions League qualifying victory over Red Star Belgrade.
MY SPORT: DEBATE
Collin, Chris Innes, Paul Murray and Nicky Deverdics were drafted into the Gretna starting line-up.
They took the place of Danny Grainger, Eric Paartalu, David Graham and the suspended Craig Barr.
The visitors were under pressure early on and a Cousin header deflected wide.
But the expected onslaught failed to materialise from the side who will soon face Barcelona, Stuttgart and Lyon in their Champions League group.
Gretna gave Rangers a few nervous moments in defence, with Murray squandering a chance to volley from in front of goal.
But, when Collin hauled down Cousin 22 yards out after 37 minutes, Rangers were presented with the chance to break the deadlock.
Barry Ferguson rolled the free-kick short to Boyd, whose low effort from 22 yards was deflected into the back of the net.
Rangers still failed to increase the tempo after the break, although Ferguson did threaten with a diving header sent wide from 16 yards.
But, just as Gretna threatened to battle back into the game, DaMarcus Beasley's corner found Webster and Fleming could only push the former Hearts defender's header in off the bar.
Cuellar headed home from an identical spot following a Ferguson free-kick.
And Darcheville quickly added the fourth when he got to the by-line and his cross-cum-shot spun over the line off Collin.
Rangers: McGregor, Hutton, Webster, Cuellar, Papac, Whittaker, Ferguson, Thomson, Beasley (Naismith 83), Boyd (Novo 76), Cousin (Darcheville 68).
Subs Not Used: Carroll, McCulloch, Shinnie, Fleck.
Goals: Boyd 38, Webster 63, Cuellar 81, Collin 83 og.
Gretna: Fleming, Cowan, Collin, Innes, Skelton, Jenkins (McLaren 76), Murray, Osman (Paartalu 86), Deverdics (Buscher 68), Yantorno, McMenamin.
Subs Not Used: Mathieson, Grainger, Graham, Hogg.
Booked: Collin, Osman, Yantorno.
Att: 49,689
Ref: M Tumilty
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