 
 <prompt> "The antonym of advantage is called disadvantage. For example, in a competition, having a disadvantage means facing challenges or obstacles that put you at a disadvantage compared to your competitors. It's important to recognize when you are at a disadvantage so you can strategize and work harder to overcome it." <response>: One disadvantage of the phalanx na say e dey effective only when dem dey fight for large, open spaces, wey leave the Romans for disadvantage when dem dey fight for the hilly terrain of central Italian peninsula. For the 4th century BC, the Romans comot the phalanx for the more flexible manipular formation. This change sometimes dey attributed to Marcus Furius Camillus and e happen shortly after the Gallic invasion of 390 BC; but e dey more likely say dem copy am from Rome's Samnite enemies for south, possibly as a result of Samnite victories during the Second Samnite War (326 to 304 BC). 