The British-patrolled south of Iraq has become significantly more dangerous for foreign troops since London announced in February that it would reduce troop numbers during this year.
Forty-one British troops have died in Iraq this year, on track to exceed the 53 killed in 2003 when Britain joined US forces in the Iraq invasion.
"The British have realized this is a war they should not be fighting or one they cannot win," Sadr said.
The cleric's words echoed comments by British commanders, who say Shiite militants are stepping up attacks to give the impression that the are driving the British out.
Also see story:
France's Kouchner begins Iraq visit, al-Maliki in Syria
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