WILLIAMSPORT, Pa. (AP) _ Baseball is like war. You don't want to give up too much ground at the outset.

Panama City, Fla., responded to a first-inning home run by Jeff Clement of Marshalltown, Iowa, with two first-inning shots Monday on the way to an 8-3 victory in a preliminary round of the 50th Little League World Series for 11- and 12-year-olds.

In Monday's opener, Julio Lara's three-run homer powered the Dominican Republic over Canada 5-1.

``It was like, `You fire your cannon, so we'll fire our cannon back,''' Panama City coach Dennis Sauls said about his team's answer to Clement's 15th home run in 16 playoff games.

Sauls had more cannons. Heath Anderson, Josh Cooper and Jody Posey _ the heaviest player in the series at 189 pounds _ hit home runs and Mark Sauls struck out 12 for Panama City.

``My curveball was on today, and I've got a good fastball to back it up,'' said Mark Sauls, the coach's son.

His right arm was packed in ice at a post-game news conference. The team travels with a physical therapist and a masseuse _ the parents of outfielder Ryan Harris _ to keep pitchers loose.

The homers by Posey and Anderson runs came in the first inning. Panama City scored three runs in the fourth on Cooper's home run, Anderson's single and Sauls' sacrifice bunt, and three more in the fifth on Trey Shields' single and a passed ball on Marshalltown catcher Mike Mogard.

Chris Sison went 2-for-2 and scored two runs for Panama City, the first Florida team in the series in five years.

Marshalltown (0-1) will play the loser of Monday night's game. The Iowans went with 11 players, three fewer than the other teams, because manager Brad Clement wanted to worry less about playing everyone. All 11 played on Monday.

The younger Clement scored all three runs for Marshalltown, and could pitch again as soon as Wednesday on two days' rest _ two fewer than most major leaguers get _ if the Iowans must win to advance.

In the first game, pitcher Anthony Miller of Canada took the loss despite striking out 12.

The Dominican batters crowded the plate to try to reach Miller's curveballs. Unsettled, he threw a wild pitch, walked two batters and gave up Lara's 220-foot home run in the first inning.

``These guys swing real hard. When you make a mistake, you pay big,'' said British Columbia manager Harvey Friesen.

Darwing Hernandez gave up only three hits for the Dominican Republic (1-0), a team of children of personnel in that nation's air force. Romer Guillen also homered for the Dominican Republic, which last had a team reach the World Series final in 1983, when they lost 3-1 to Marietta, Ga.

Adam Loewen drove in Canada's only run with a sixth-inning single.

The Dominican Republic advances to Tuesday's game against the winner of Monday night's game between Saudi Arabia and the favorite, Chinese Tapei. The Canadian team from suburban Vancouver will next play the loser of Monday night's game in the international division of the round-robin tournament.

The top two teams in each division _ U.S. and international _ will play in Thursday's semifinals for a spot in Saturday's championship.