The phrase "an army of around" is correct and usable in written English.
It can be used to describe a large group or number of people or things, often in a figurative sense, indicating a significant quantity.
Example: "The event attracted an army of around two thousand enthusiastic fans."
Alternatives: "a multitude of approximately" or "a crowd of about".
The core would be an army of around 110,000.
But only 130 galleys and an army of around 15,000 infantry, mostly Spaniards, were all that could be gathered.
In the Olive Grove of Koundouros in Messenia, they confronted an army of around 5,000 Peloponnesian Greeks under the command of Michael I Ducas.
Sigismund used the killing of his envoy Lancki by the landmeister's son as an excuse to invade the southern portion of Livonia with an army of around 80,000.
At the end of the presentation, an army of around 40 members of the design team came on stage to whoops and cheers from the audience.
The full list of countries in the alliance appear to include the partially-recognised state of Palestine and the tiny African island state of Comoros, with an army of around 500 soldiers.
Iran, which has a similar size population, has a standing army of around 450,000.
"That's the whole Armstrong nature, to have an army of people around him, and it's been like that for years," said James Startt, a reporter for Bicycling magazine who is covering his 21st Tour.
However, it also continues to take out patents at a record pace in other areas, such as advanced materials, and in the process racks up some $1 billion a year in licensing fees.Since an army of programmers around the world work on developing Linux essentially at no cost, IBM now has an extremely cheap and robust operating system.
One has quite an army of supporters - around 2 million of them are registered around the world.
Using his brother's old contacts, he raised an army of volunteers from around Khanabad and began attacking the Taliban.
