Stratego (/strəˈtiːɡoʊ/ strə-TEE-goh) is a strategy board game for two players on a board of 10×10 squares. Each player controls 40 pieces representing individual officer and soldier ranks in an army. The pieces have Napoleonic insignia. The objective of the game is to find and capture the opponent's Flag, or to capture so many enemy pieces that the opponent cannot make any further moves. Stratego has simple enough rules for young children to play but a depth of strategy that is also appealing to adults. The game is a slightly modified copy of an early 20th century French game named L'Attaque [fr] ("The Attack"). It has been in production in Europe since World War II and the United States since 1961. There are now two- and four-handed versions, versions with 10, 30 or 40 pieces per player, and boards with smaller sizes (number of spaces). There are also variant pieces and different rulesets.
https://en.wikipedia.org/wiki/Stratego
You may have this one already, or a version of it: Axis and Allies
Axis & Allies is a series of World War II strategy board games. The first version was first published in 1981 and a second edition known colloquially as Axis & Allies: Classic was published in 1984. Played on a board depicting a Spring 1942 political map of Earth divided by territories, players take the role of one or more of the five major belligerents of World War II: the Axis powers of Germany and Japan; and the Allied powers of the Soviet Union, the United Kingdom, and the United States. Turn rotates among these belligerents, who control armies of playing pieces with which they attempt to capture enemy territories, with results determined by dice rolls.
More than ten spinoff games have since been produced. Some of these editions are revised versions of the classic game, while others depict a specific theater, campaign or battle of World War II.
https://en.wikipedia.org/wiki/Axis_%26_Allies