May 27 (Reuters) - Islamist insurgents firing grenades attacked Ugandan peacekeepers in Mogadishu, killing at least 10 people and injuring a dozen others in the crossfire, residents and officials said on Tuesday.

Here is a chronology of events in Somalia:

October 2004 - In 14th attempt since 1991 to restore central government, deputies elect Ethiopian-backed warlord Abdullahi Yusuf as president. In December, Prime Minister Mohamed Ali Gedi swears in 27 ministers in Kenya.

June 2006 - The Somalia Islamic Courts Council (SICC) seizes the capital Mogadishu from U.S.-backed warlords and takes control of parts of southern Somalia.

Oct. 9 - Islamists declare holy war against Ethiopia, which they accuse of invading Somalia to help the government.

Dec. 24 - Ethiopian Prime Minister Meles Zenawi says he is waging war on the Islamists to protect Ethiopia's sovereignty, in the country's first public admission of military involvement.

Dec. 28 - Islamists flee Mogadishu ahead of a joint Ethiopian and Somali government force which captures the city.

Dec. 31 - Prime Minister Gedi enters Mogadishu.

Jan. 8, 2007 - Yusuf arrives in Mogadishu for the first time since he became president in 2004.

Feb. 20 - U.N. Security Council authorises African Union peacekeeping mission for Somalia for 6 months. A Ugandan vanguard flies into Baidoa on March 1.

April 26 - Gedi says "most fighting" in Mogadishu has finished after a series of battles with Islamists which killed at least 1,300 people and forced hundreds of thousands to flee.

Aug 30 - Yusuf winds up 6-week-long peace conference, which had no visible impact on insurgency. Islamists and some other opposition figures had boycotted the talks.

Oct 8 - Gedi reaches a truce with Mogadishu's dominant Hawiye clan, some of whom had supported Islamist-led insurgents.

Oct 27 - Heavy fighting erupts in Mogadishu between insurgents and Ethiopian troops. Residents say dozens of people are killed in the three days of battles that follow. Oct 29 - Gedi resigns after a long feud with the president.

Nov 2 - Battles break out in Mogadishu again.

Nov 24 - Parliament swears in Nur Hassan Hussein as prime minister.

Dec 24 - Burundi deploys a contingent of 192 peacekeepers to Mogadishu to bolster a struggling AU force.

Dec 31 - Local human rights group says that 6,500 civilians were killed in Mogadishu in 2007.

Feb 5, 2008 - An explosion kills at least 20 Ethiopian immigrants in the northern port of Bossasso. The al Shabaab militant group, an Islamist group linked to al Qaeda, later claims responsibility.

March 3 - Two U.S. missiles hit a house in southern Somalia in an attack Washington said was directed at "known terrorists".

March 26 - Islamist fighters seize the town of Jowhar, the most significant of several towns captured in recent months from the Western-backed government. They seize it again on April 9.

April 22 - Militias allied to the government recapture the southern port of Guda from the al Shabaab wing, taking the death toll from an upsurge of recent fighting to nearly 100.

May 1 - A U.S. air strike kills Aden Hashi Ayro, an Islamist commander thought to be al Qaeda's leader in Somalia and at least 30 other people on the small central town of Dusamareb.

AlertNet news is provided by