Neatly

No, that's incongruous. Neatness doesn't fit the image of power and authority.

You might describe a formation or a uniform as "neat," but not the action of marching.

You might say, "The ranks and files were neatly ordered."

Thanks. but, how do I correct it without changing the meaning?

May be "accurately" will fit well, won't it?

Expertly and skillfully may also be taken into consideration I guess.

Army is a collective noun - the army (of soldiers) is marching.

'Smartly' would be more apt than 'neatly'.

KateJSArmy is a collective noun - the army (of soldiers) is marching.

I think army is one of those collective nouns which can go either way, depending on how you think of it. The committee are all in favor except one. The committee votes to suspend the rule.

Hi,
At least in Western terms, an 'army' consists of many thousands of soldiers. So, it sounds a bit odd odd to speak of an entire army marching together.
Less odd would be to say, eg 'The soldiers are marching, the regiment is marching, the company is marching'.

Clive