Bind IEnumerable results

Hi, I have a method that returns an IEnumerable<Actu> res. I would like to return a new  IEnumerable<Actu> res for 3 different webs and after bind the result in one only IEnumerable<Actu> res object, is it possible?

SPList listeLinks = web.Lists[Actualites_ListeName];SPListItemCollection colItem = listeLinks.Items;foreach (SPListItem item in colItem)
{
    // Enters here 3 times and get 3 different URLs from a link list
    string url = item[SPBuiltInFieldId.URL].ToString();    SPSite siteItem = newSPSite(url);    SPWeb webItem = site.OpenWeb();    IEnumerable<Actu> res = ActuService.GetItems(webItem, Actualite_Return);
}