public struct Troops
{
    public object[] Regiments;
}
public struct RegimentOne
{
     public string General1;
     public string General2;
     public string General3;
     public string General4;
     //etc, etc, etc...and no i don't know if thats correct army groups or whatever      you get what i mean
     public string troop1;
     public string troop2;
     public string troop3;
     public string troop4;
     public string troop5;
     ///etc, etc, etc...
}
// etc, etc, etc...
//now i send all the regiment structures to the army structure
public void Army()
{
     Troops army = new Troops();
     army.Regiments = new object[] { *all my declared regiments in here };
}
//now i send the objects in the army structure to another form
public void button1_click(object sender, EventArgs e){

Form2 frm2 = new Form2(army.Regiment);
frm2.Show();
this.Hide();
}

// form2 constructor, something like this
public Form2(object[] arrayOfObjects) {
    int index = 0;
    string str = ((RegimentOne)arrayOfObjects[index]).troop4;
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;

namespace TestForms {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
        }


        public struct Troops {
            public object[] Regiments;
        }
        public struct RegimentOne {
            public string General1;
            public string General2;
            public string General3;
            public string General4;
            
            public string troop1;
            public string troop2;
            public string troop3;
            public string troop4;
            public string troop5;
        }

        Troops army;

        public void Army() {
            army = new Troops();
            army.Regiments = new object[2];
            RegimentOne r = new RegimentOne();
            r.troop4 = "troops4";
            army.Regiments[0] = r;          
            army.Regiments[1] = new RegimentOne();
        }

        private void button2_Click(object sender, EventArgs e) {
            Army();
            Form2 frm2 = new Form2(army.Regiments);
        }
    }
}

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace TestForms {
    public partial class Form2 : Form {
        public Form2(object[] arrayOfObjects) {
            InitializeComponent();
            int index = 0;
            string str = ((TestForms.Form1.RegimentOne)arrayOfObjects[index]).troop4;
            MessageBox.Show(str);
        }
    }
}