CORRECTED-WRAPUP 1-Assad troops fight to oust rebels from Damascus

(Removes reference to Italy giving diplomatic recognition to

the Syrian opposition. It has recognised the group as

"legitimate representatives".)

* Heaviest fighting in Damascus for months

* NATO agrees to deploy missile defence on Turkish border

* Britain recognises opposition coalition

AMMAN, Nov 20 (Reuters) - Syrian government troops backed by

tanks battled to oust rebel forces from an opposition stronghold

in a Damascus suburb on Tuesday in the heaviest fighting in the

capital for months.

In action in the country's north, rebel fighters stormed an

air defence base that President Bashar al-Assad's military had

used to bombard areas near the Turkish border.

On the international front, the Turkish foreign minister

said NATO states had agreed to supply Turkey with a Patriot

missile system to defend against Syrian cross-border shelling.

Although the deployment would be for defensive purposes

only, it nonetheless marked a hardening in the foreign

opposition to Assad.

The rebels also received a diplomatic lift with Britain

officially recognising the opposition Syrian National Coalition,

set up this month to boost their chances of securing foreign aid

and arms, as the legitimate representative of the Syrian people.

It was the ninth country to do so following France, Turkey

and the Gulf Arab states.

After months of slow progress marked by poor organisation

and supply problems, the rebels have captured several army

positions in outlying regions in the last week, including a

Special Forces base near Aleppo, Syria's commercial hub.

They are also trying to take the 20-month-old revolt to the

heart of Damascus, Assad's seat of power, and have dubbed this

week "March to Damascus Week".

Elite Republican Guard troops backed by tanks attacked the

rebel stronghold of Daraya on the city's southwestern edge and

were met by fierce resistance from rebels, who hung on to their

positions despite days of aerial bombardment, oppostion sources

said.

Twelve people were killed on Monday in Daraya, mostly by

aerial bombing preparing for the ground offensive, activists

said. Thousands of residents had fled to nearby suburbs.

A Western diplomat following the fighting said Assad had to

show he could repel the rebel challenge to Damascus.

"He has to show that letting the bases fall in and round

Damascus is only temporary while he begins to consolidate

resources and personnel and deals with the struggles in the

east," the diplomat said.

Also on Tuesday, two mortar rounds hit the Information

Ministry building in Damascus, causing damage but no casualties,

state televison said. It blamed "terrorists" for the attack, the

usual government term for anti-Assad forces.

On Monday, rebels seized the headquarters of an army

battalion near the southern gate of Damascus, the nearest

military base to the capital reported to have fallen to

opposition fighters.

In the north, opposition sources said rebel fighters had

captured sections an air defence base at Sheikh Suleiman, 18 km

(11 miles) from the Turkish border and 30 km (20 miles)

northwest of Aleppo.

"The fighters have taken three artillery pieces and have

entered most of the base. Fighter jets are flying over the area

to try and force them out," said Abu Mujahed al-Halabi, an

activist with the opposition Sham News Network.

A rebel source said the fighters seized large stocks of

explosives and would withdraw to avoid retaliatory air strikes.

"Assad's forces use the base to shell many villages and

towns in the countryside. It is now neutralised," the source

said.

MISSILES ON THE BORDER

In Ankara, Turkish Foreign Minister Ahmet Davutoglu said

NATO states had agreed to supply Turkey with an advanced Patriot

missile system to defend against Syrian attacks. Talks on its

deployment are in the final stage, he said.

In recent months artillery and mortar fire from Syria has

landed inside Turkey, increasing concern that the anti-Assad

uprising could turn into a regional conflagration.

Turkey, Gulf Arab states and Western powers have all called

for Assad - whose Alawite family have ruled Sunni

Muslim-majority Syria in autocratic fashion for four decades -

to relinquish power. Assad counts on the support of long-time

ally Russia and Shi'ite Iran.

NATO Secretary General Anders Fogh Rasmussen said on Monday

that any missile deployment would be a defensive measure and not

to enforce a no-fly zone over Syria.

Although the rebels have taken large swathes of land, they

are almost defenceless against the government's air force. They

have called for an internationally enforced no-fly zone, a

measure that helped Libyan rebels overthrow dictator Muammar

Gaddafi last year.

Despite strong censure of Assad, Western powers have shied

away from direct military involvement.

But the political campaign against Assad took a step forward

on Tuesday when British Foreign Secretary William Hague

announced that Britain had decided to recognise the new

coalition of Syrian revolutionary and opposition forces as the

people's sole legitimate representative.

(Reporting by Khaled Yacoub Oweis in Amman; Oliver Holmes,

Erika Solomon and Dominic Evans in Beirut; Mohammed Abbas in

London, Gulsen Solaker and Ece Toksabay; Writing by Angus

MacSwan)