Home work - transfer soldier

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Home_Work
{
    class Program
    {
        static void Main()
        {
            Database database = new Database();
            database.Work();
        }
    }

    class Database
    {
        private List<Soldier> _squad1;
        private List<Soldier> _squad2;

        public Database()
        {
            _squad1 = new List<Soldier>();
            _squad2 = new List<Soldier>();
            Fill();
        }

        public void Work()
        {
            ShowSoldiers();
            TransferSoldiers();
            ShowSoldiers();
        }

        private void TransferSoldiers()
        {
            _squad2 = _squad2.Union(_squad1.Where(soldier => soldier.FullName.StartsWith("Б"))).ToList();
            _squad1 = _squad1.Where(soldier => !soldier.FullName.StartsWith("Б")).ToList();
            Console.WriteLine("\nСолдат перевели!\n");
        }

        private void ShowSoldiers()
        {
            Console.WriteLine("Первый взвод: \n");

            foreach (Soldier soldier in _squad1)
            {
                soldier.ShowInfo();
            }

            Console.WriteLine("\nВторой взвод: \n");

            foreach (Soldier soldier in _squad2)
            {
                soldier.ShowInfo();
            }
        }

        private void Fill()
        {
            _squad1.Add(new Soldier("Черёмушко"));
            _squad1.Add(new Soldier("Барсал"));
            _squad1.Add(new Soldier("Альанах"));
            _squad1.Add(new Soldier("Вассерман"));
            _squad1.Add(new Soldier("Борн"));
            _squad2.Add(new Soldier("Макуночи"));
            _squad2.Add(new Soldier("Грозный"));
            _squad2.Add(new Soldier("Ветлугаев"));
            _squad2.Add(new Soldier("Навальный"));
            _squad2.Add(new Soldier("Евпатий"));

        }
    }

    class Soldier
    {
        private string _fullName;

        public Soldier(string fullName)
        {
            _fullName = fullName;
        }

        public string FullName => _fullName;

        public void ShowInfo()
        {
            Console.WriteLine($"{_fullName}");
        }
    }
}